From 8fdcf773a7edf1f58767e0f47d395fbcad2b008d Mon Sep 17 00:00:00 2001
From: Randell Dawson <rdawson@onepathtech.com>
Date: Fri, 18 Sep 2020 14:21:06 -0700
Subject: [PATCH] fix(curriculum): remove isRequired from chinese

---
 .../build-a-personal-portfolio-webpage.chinese.md                | 1 -
 .../build-a-product-landing-page.chinese.md                      | 1 -
 .../build-a-survey-form.chinese.md                               | 1 -
 .../build-a-technical-documentation-page.chinese.md              | 1 -
 .../build-a-tribute-page.chinese.md                              | 1 -
 .../basic-algorithm-scripting/boo-who.chinese.md                 | 1 -
 .../basic-algorithm-scripting/chunky-monkey.chinese.md           | 1 -
 .../basic-algorithm-scripting/confirm-the-ending.chinese.md      | 1 -
 .../convert-celsius-to-fahrenheit.chinese.md                     | 1 -
 .../basic-algorithm-scripting/factorialize-a-number.chinese.md   | 1 -
 .../basic-algorithm-scripting/falsy-bouncer.chinese.md           | 1 -
 .../find-the-longest-word-in-a-string.chinese.md                 | 1 -
 .../basic-algorithm-scripting/finders-keepers.chinese.md         | 1 -
 .../basic-algorithm-scripting/mutations.chinese.md               | 1 -
 .../repeat-a-string-repeat-a-string.chinese.md                   | 1 -
 .../return-largest-numbers-in-arrays.chinese.md                  | 1 -
 .../basic-algorithm-scripting/reverse-a-string.chinese.md        | 1 -
 .../basic-algorithm-scripting/slice-and-splice.chinese.md        | 1 -
 .../basic-algorithm-scripting/title-case-a-sentence.chinese.md   | 1 -
 .../basic-algorithm-scripting/truncate-a-string.chinese.md       | 1 -
 .../basic-algorithm-scripting/where-do-i-belong.chinese.md       | 1 -
 .../arguments-optional.chinese.md                                | 1 -
 .../intermediate-algorithm-scripting/binary-agents.chinese.md    | 1 -
 .../convert-html-entities.chinese.md                             | 1 -
 .../intermediate-algorithm-scripting/diff-two-arrays.chinese.md  | 1 -
 .../intermediate-algorithm-scripting/dna-pairing.chinese.md      | 1 -
 .../intermediate-algorithm-scripting/drop-it.chinese.md          | 1 -
 .../everything-be-true.chinese.md                                | 1 -
 .../intermediate-algorithm-scripting/missing-letters.chinese.md  | 1 -
 .../intermediate-algorithm-scripting/pig-latin.chinese.md        | 1 -
 .../search-and-replace.chinese.md                                | 1 -
 .../intermediate-algorithm-scripting/seek-and-destroy.chinese.md | 1 -
 .../smallest-common-multiple.chinese.md                          | 1 -
 .../intermediate-algorithm-scripting/sorted-union.chinese.md     | 1 -
 .../intermediate-algorithm-scripting/spinal-tap-case.chinese.md  | 1 -
 .../intermediate-algorithm-scripting/steamroller.chinese.md      | 1 -
 .../sum-all-numbers-in-a-range.chinese.md                        | 1 -
 .../sum-all-odd-fibonacci-numbers.chinese.md                     | 1 -
 .../intermediate-algorithm-scripting/sum-all-primes.chinese.md   | 1 -
 .../wherefore-art-thou.chinese.md                                | 1 -
 .../caesars-cipher.chinese.md                                    | 1 -
 .../cash-register.chinese.md                                     | 1 -
 .../palindrome-checker.chinese.md                                | 1 -
 .../roman-numeral-converter.chinese.md                           | 1 -
 .../telephone-number-validator.chinese.md                        | 1 -
 .../front-end-libraries-projects/build-a-25-5-clock.chinese.md   | 1 -
 .../front-end-libraries-projects/build-a-drum-machine.chinese.md | 1 -
 .../build-a-javascript-calculator.chinese.md                     | 1 -
 .../build-a-markdown-previewer.chinese.md                        | 1 -
 .../build-a-random-quote-machine.chinese.md                      | 1 -
 .../react-and-redux/connect-redux-to-react.chinese.md            | 1 -
 .../react-and-redux/connect-redux-to-the-messages-app.chinese.md | 1 -
 .../react-and-redux/extract-local-state-into-redux.chinese.md    | 1 -
 .../react-and-redux/extract-state-logic-to-redux.chinese.md      | 1 -
 .../react-and-redux/getting-started-with-react-redux.chinese.md  | 1 -
 .../react-and-redux/manage-state-locally-first.chinese.md        | 1 -
 .../react-and-redux/map-dispatch-to-props.chinese.md             | 1 -
 .../react-and-redux/map-state-to-props.chinese.md                | 1 -
 .../react-and-redux/moving-forward-from-here.chinese.md          | 1 -
 .../use-provider-to-connect-redux-to-react.chinese.md            | 1 -
 .../react/access-props-using-this.props.chinese.md               | 1 -
 .../03-front-end-libraries/react/add-comments-in-jsx.chinese.md  | 1 -
 .../03-front-end-libraries/react/add-event-listeners.chinese.md  | 1 -
 .../react/add-inline-styles-in-react.chinese.md                  | 1 -
 .../react/bind-this-to-a-class-method.chinese.md                 | 1 -
 ...-inline-css-conditionally-based-on-component-state.chinese.md | 1 -
 .../react/compose-react-components.chinese.md                    | 1 -
 .../react/create-a-complex-jsx-element.chinese.md                | 1 -
 .../react/create-a-component-with-composition.chinese.md         | 1 -
 .../react/create-a-controlled-form.chinese.md                    | 1 -
 .../react/create-a-controlled-input.chinese.md                   | 1 -
 .../react/create-a-react-component.chinese.md                    | 1 -
 .../react/create-a-simple-jsx-element.chinese.md                 | 1 -
 .../react/create-a-stateful-component.chinese.md                 | 1 -
 .../react/create-a-stateless-functional-component.chinese.md     | 1 -
 .../react/define-an-html-class-in-jsx.chinese.md                 | 1 -
 .../give-sibling-elements-a-unique-key-attribute.chinese.md      | 1 -
 .../react/introducing-inline-styles.chinese.md                   | 1 -
 .../react/learn-about-self-closing-jsx-tags.chinese.md           | 1 -
 .../optimize-re-renders-with-shouldcomponentupdate.chinese.md    | 1 -
 .../react/override-default-props.chinese.md                      | 1 -
 .../react/pass-a-callback-as-props.chinese.md                    | 1 -
 .../react/pass-an-array-as-props.chinese.md                      | 1 -
 .../pass-props-to-a-stateless-functional-component.chinese.md    | 1 -
 .../react/pass-state-as-props-to-child-components.chinese.md     | 1 -
 .../react/render-a-class-component-to-the-dom.chinese.md         | 1 -
 .../react/render-conditionally-from-props.chinese.md             | 1 -
 .../react/render-html-elements-to-the-dom.chinese.md             | 1 -
 .../render-react-on-the-server-with-rendertostring.chinese.md    | 1 -
 .../render-state-in-the-user-interface-another-way.chinese.md    | 1 -
 .../react/render-state-in-the-user-interface.chinese.md          | 1 -
 .../react/render-with-an-if-else-condition.chinese.md            | 1 -
 ...w-using-props-with-stateless-functional-components.chinese.md | 1 -
 .../react/set-state-with-this.setstate.chinese.md                | 1 -
 .../react/use--for-a-more-concise-conditional.chinese.md         | 1 -
 ...use-a-ternary-expression-for-conditional-rendering.chinese.md | 1 -
 .../use-advanced-javascript-in-react-render-method.chinese.md    | 1 -
 .../use-array.filter-to-dynamically-filter-an-array.chinese.md   | 1 -
 .../use-array.map-to-dynamically-render-elements.chinese.md      | 1 -
 .../03-front-end-libraries/react/use-default-props.chinese.md    | 1 -
 .../use-proptypes-to-define-the-props-you-expect.chinese.md      | 1 -
 .../react/use-react-to-render-nested-components.chinese.md       | 1 -
 .../react/use-state-to-toggle-an-element.chinese.md              | 1 -
 .../react/use-the-lifecycle-method-componentdidmount.chinese.md  | 1 -
 .../react/use-the-lifecycle-method-componentwillmount.chinese.md | 1 -
 .../react/write-a-react-component-from-scratch.chinese.md        | 1 -
 .../react/write-a-simple-counter.chinese.md                      | 1 -
 .../redux/combine-multiple-reducers.chinese.md                   | 1 -
 .../redux/copy-an-object-with-object.assign.chinese.md           | 1 -
 .../03-front-end-libraries/redux/create-a-redux-store.chinese.md | 1 -
 .../redux/define-a-redux-action.chinese.md                       | 1 -
 .../redux/define-an-action-creator.chinese.md                    | 1 -
 .../redux/dispatch-an-action-event.chinese.md                    | 1 -
 .../redux/get-state-from-the-redux-store.chinese.md              | 1 -
 .../redux/handle-an-action-in-the-store.chinese.md               | 1 -
 .../03-front-end-libraries/redux/never-mutate-state.chinese.md   | 1 -
 .../redux/register-a-store-listener.chinese.md                   | 1 -
 .../redux/remove-an-item-from-an-array.chinese.md                | 1 -
 .../redux/send-action-data-to-the-store.chinese.md               | 1 -
 .../use-a-switch-statement-to-handle-multiple-actions.chinese.md | 1 -
 .../redux/use-const-for-action-types.chinese.md                  | 1 -
 .../use-middleware-to-handle-asynchronous-actions.chinese.md     | 1 -
 .../redux/use-the-spread-operator-on-arrays.chinese.md           | 1 -
 .../redux/write-a-counter-with-redux.chinese.md                  | 1 -
 .../visualize-data-with-a-bar-chart.chinese.md                   | 1 -
 .../visualize-data-with-a-choropleth-map.chinese.md              | 1 -
 .../visualize-data-with-a-heat-map.chinese.md                    | 1 -
 .../visualize-data-with-a-scatterplot-graph.chinese.md           | 1 -
 .../visualize-data-with-a-treemap-diagram.chinese.md             | 1 -
 .../apis-and-microservices-projects/exercise-tracker.chinese.md  | 1 -
 .../file-metadata-microservice.chinese.md                        | 1 -
 .../request-header-parser-microservice.chinese.md                | 1 -
 .../timestamp-microservice.chinese.md                            | 1 -
 .../url-shortener-microservice.chinese.md                        | 1 -
 .../american-british-translator.chinese.md                       | 1 -
 .../quality-assurance-projects/issue-tracker.chinese.md          | 1 -
 .../metric-imperial-converter.chinese.md                         | 1 -
 .../quality-assurance-projects/personal-library.chinese.md       | 1 -
 .../quality-assurance-projects/sudoku-solver.chinese.md          | 1 -
 .../python-for-everybody/build-your-own-functions.chinese.md     | 1 -
 .../python-for-everybody/comparing-and-sorting-tuples.chinese.md | 1 -
 .../python-for-everybody/conditional-execution.chinese.md        | 1 -
 .../data-visualization-mailing-lists.chinese.md                  | 1 -
 .../python-for-everybody/data-visualization-page-rank.chinese.md | 1 -
 .../python-for-everybody/dictionaries-and-loops.chinese.md       | 1 -
 .../dictionaries-common-applications.chinese.md                  | 1 -
 .../python-for-everybody/files-as-a-sequence.chinese.md          | 1 -
 .../python-for-everybody/intermediate-expressions.chinese.md     | 1 -
 .../python-for-everybody/intermediate-strings.chinese.md         | 1 -
 .../introduction-elements-of-python.chinese.md                   | 1 -
 .../introduction-hardware-achitecture.chinese.md                 | 1 -
 .../introduction-python-as-a-language.chinese.md                 | 1 -
 .../python-for-everybody/introduction-why-program.chinese.md     | 1 -
 .../python-for-everybody/iterations-definite-loops.chinese.md    | 1 -
 .../python-for-everybody/iterations-loop-idioms.chinese.md       | 1 -
 .../python-for-everybody/iterations-more-patterns.chinese.md     | 1 -
 .../python-for-everybody/loops-and-iterations.chinese.md         | 1 -
 .../python-for-everybody/make-a-relational-database.chinese.md   | 1 -
 .../python-for-everybody/more-conditional-structures.chinese.md  | 1 -
 .../python-for-everybody/networking-protocol.chinese.md          | 1 -
 .../python-for-everybody/networking-text-processing.chinese.md   | 1 -
 .../networking-using-urllib-in-python.chinese.md                 | 1 -
 .../networking-web-scraping-with-python.chinese.md               | 1 -
 .../python-for-everybody/networking-with-python.chinese.md       | 1 -
 .../networking-write-a-web-browser.chinese.md                    | 1 -
 .../python-for-everybody/object-lifecycle.chinese.md             | 1 -
 .../python-for-everybody/objects-a-sample-class.chinese.md       | 1 -
 .../python-for-everybody/objects-inheritance.chinese.md          | 1 -
 .../python-for-everybody/python-dictionaries.chinese.md          | 1 -
 .../python-for-everybody/python-functions.chinese.md             | 1 -
 .../python-for-everybody/python-lists.chinese.md                 | 1 -
 .../python-for-everybody/python-objects.chinese.md               | 1 -
 .../python-for-everybody/reading-files.chinese.md                | 1 -
 .../regular-expressions-matching-and-extracting-data.chinese.md  | 1 -
 .../regular-expressions-practical-applications.chinese.md        | 1 -
 .../python-for-everybody/regular-expressions.chinese.md          | 1 -
 .../python-for-everybody/relational-database-design.chinese.md   | 1 -
 .../relational-databases-and-sqlite.chinese.md                   | 1 -
 .../relational-databases-join-operation.chinese.md               | 1 -
 .../relational-databases-many-to-many-relationships.chinese.md   | 1 -
 .../relational-databases-relationship-building.chinese.md        | 1 -
 ...epresenting-relationships-in-a-relational-database.chinese.md | 1 -
 .../python-for-everybody/strings-and-lists.chinese.md            | 1 -
 .../python-for-everybody/strings-in-python.chinese.md            | 1 -
 .../python-for-everybody/the-tuples-collection.chinese.md        | 1 -
 .../python-for-everybody/using-web-services.chinese.md           | 1 -
 .../variables-expressions-and-statements.chinese.md              | 1 -
 .../python-for-everybody/visualizing-data-with-python.chinese.md | 1 -
 .../web-services-api-rate-limiting-and-security.chinese.md       | 1 -
 .../python-for-everybody/web-services-apis.chinese.md            | 1 -
 .../python-for-everybody/web-services-json.chinese.md            | 1 -
 .../web-services-service-oriented-approach.chinese.md            | 1 -
 .../python-for-everybody/web-services-xml-schema.chinese.md      | 1 -
 .../python-for-everybody/web-services-xml.chinese.md             | 1 -
 .../python-for-everybody/working-with-lists.chinese.md           | 1 -
 .../arithmetic-formatter.chinese.md                              | 1 -
 .../budget-app.chinese.md                                        | 1 -
 .../polygon-area-calculator.chinese.md                           | 1 -
 .../probability-calculator.chinese.md                            | 1 -
 .../time-calculator.chinese.md                                   | 1 -
 .../demographic-data-analyzer.chinese.md                         | 1 -
 .../mean-variance-standard-deviation-calculator.chinese.md       | 1 -
 .../medical-data-visualizer.chinese.md                           | 1 -
 .../page-view-time-series-visualizer.chinese.md                  | 1 -
 .../sea-level-predictor.chinese.md                               | 1 -
 .../anonymous-message-board.chinese.md                           | 1 -
 .../information-security-projects/port-scanner.chinese.md        | 1 -
 .../secure-real-time-multiplayer-game.chinese.md                 | 1 -
 .../sha-1-password-cracker.chinese.md                            | 1 -
 .../information-security-projects/stock-price-checker.chinese.md | 1 -
 .../take-home-projects/build-a-camper-leaderboard.chinese.md     | 1 -
 .../take-home-projects/build-a-light-bright-app.chinese.md       | 1 -
 .../build-a-nightlife-coordination-app.chinese.md                | 1 -
 .../take-home-projects/build-a-pong-game.chinese.md              | 1 -
 .../take-home-projects/build-a-recipe-box.chinese.md             | 1 -
 .../build-a-roguelike-dungeon-crawler-game.chinese.md            | 1 -
 .../take-home-projects/build-a-simon-game.chinese.md             | 1 -
 .../take-home-projects/build-a-tic-tac-toe-game.chinese.md       | 1 -
 .../take-home-projects/build-a-voting-app.chinese.md             | 1 -
 .../take-home-projects/build-a-wikipedia-viewer.chinese.md       | 1 -
 .../build-an-image-search-abstraction-layer.chinese.md           | 1 -
 .../take-home-projects/build-the-game-of-life.chinese.md         | 1 -
 .../take-home-projects/chart-the-stock-market.chinese.md         | 1 -
 .../take-home-projects/map-data-across-the-globe.chinese.md      | 1 -
 .../take-home-projects/p2p-video-chat-application.chinese.md     | 1 -
 ...ow-national-contiguity-with-a-force-directed-graph.chinese.md | 1 -
 .../take-home-projects/show-the-local-weather.chinese.md         | 1 -
 .../take-home-projects/use-the-twitch-json-api.chinese.md        | 1 -
 .../book-recommendation-engine-using-knn.chinese.md              | 1 -
 .../cat-and-dog-image-classifier.chinese.md                      | 1 -
 .../linear-regression-health-costs-calculator.chinese.md         | 1 -
 .../neural-network-sms-text-classifier.chinese.md                | 1 -
 .../rock-paper-scissors.chinese.md                               | 1 -
 233 files changed, 233 deletions(-)

diff --git a/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-personal-portfolio-webpage.chinese.md b/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-personal-portfolio-webpage.chinese.md
index aa8513ef42..e13b03c7e3 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-personal-portfolio-webpage.chinese.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-personal-portfolio-webpage.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7158d8c242eddfaeb5bd13
 title: Build a Personal Portfolio Webpage
-isRequired: true
 challengeType: 3
 forumTopicId: 301143
 localeTitle: 制作一个个人作品集网页
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-product-landing-page.chinese.md b/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-product-landing-page.chinese.md
index be308c2617..80c574fd19 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-product-landing-page.chinese.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-product-landing-page.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: 587d78af367417b2b2512b04
 title: Build a Product Landing Page
-isRequired: true
 challengeType: 3
 forumTopicId: 301144
 localeTitle: 制作一个产品登录页
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-survey-form.chinese.md b/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-survey-form.chinese.md
index 26f7f59717..3b952e18d0 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-survey-form.chinese.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-survey-form.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: 587d78af367417b2b2512b03
 title: Build a Survey Form
-isRequired: true
 challengeType: 3
 forumTopicId: 301145
 localeTitle: 制作一个调查表格
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-technical-documentation-page.chinese.md b/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-technical-documentation-page.chinese.md
index f02c0c88f8..c681436f77 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-technical-documentation-page.chinese.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-technical-documentation-page.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: 587d78b0367417b2b2512b05
 title: Build a Technical Documentation Page
-isRequired: true
 challengeType: 3
 forumTopicId: 301146
 localeTitle: 制作一个技术文档页面
diff --git a/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-tribute-page.chinese.md b/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-tribute-page.chinese.md
index 1f66903027..4db40ba30a 100644
--- a/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-tribute-page.chinese.md
+++ b/curriculum/challenges/chinese/01-responsive-web-design/responsive-web-design-projects/build-a-tribute-page.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7158d8c442eddfaeb5bd18
 title: Build a Tribute Page
-isRequired: true
 challengeType: 3
 forumTopicId: 301147
 localeTitle: 制作一个致敬页
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/boo-who.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/boo-who.chinese.md
index 945aa3fdc2..293b2b3b7f 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/boo-who.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/boo-who.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a77dbc43c33f39daa4429b4f
 title: Boo who
-isRequired: true
 challengeType: 5
 videoUrl: ''
 localeTitle: 嘘谁
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/chunky-monkey.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/chunky-monkey.chinese.md
index 6f02514742..0e5bf65ffd 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/chunky-monkey.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/chunky-monkey.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a9bd25c716030ec90084d8a1
 title: Chunky Monkey
-isRequired: true
 challengeType: 5
 videoUrl: ''
 localeTitle: 矮胖的猴子
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/confirm-the-ending.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/confirm-the-ending.chinese.md
index 248f6cc1c8..0078b19261 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/confirm-the-ending.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/confirm-the-ending.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: acda2fb1324d9b0fa741e6b5
 title: Confirm the Ending
-isRequired: true
 challengeType: 5
 videoUrl: ''
 localeTitle: 确认结束
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/convert-celsius-to-fahrenheit.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/convert-celsius-to-fahrenheit.chinese.md
index fea02190cd..457e9e12f2 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/convert-celsius-to-fahrenheit.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/convert-celsius-to-fahrenheit.chinese.md
@@ -2,7 +2,6 @@
 id: 56533eb9ac21ba0edf2244b3
 title: Convert Celsius to Fahrenheit
 challengeType: 1
-isRequired: true
 videoUrl: ''
 localeTitle: 将摄氏温度转换为华氏温度
 ---
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/factorialize-a-number.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/factorialize-a-number.chinese.md
index 03d4342558..f8f7c2a25e 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/factorialize-a-number.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/factorialize-a-number.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a302f7aae1aa3152a5b413bc
 title: Factorialize a Number
-isRequired: true
 challengeType: 5
 videoUrl: ''
 localeTitle: 对一个数字进行推理
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/falsy-bouncer.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/falsy-bouncer.chinese.md
index b3a0a3db57..50d6ab547b 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/falsy-bouncer.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/falsy-bouncer.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: adf08ec01beb4f99fc7a68f2
 title: Falsy Bouncer
-isRequired: true
 challengeType: 5
 videoUrl: ''
 localeTitle: Falsy Bouncer
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/find-the-longest-word-in-a-string.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/find-the-longest-word-in-a-string.chinese.md
index 88b1bff255..1286bb3c55 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/find-the-longest-word-in-a-string.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/find-the-longest-word-in-a-string.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a26cbbe9ad8655a977e1ceb5
 title: Find the Longest Word in a String
-isRequired: true
 challengeType: 5
 videoUrl: ''
 localeTitle: 找到字符串中最长的单词
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/finders-keepers.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/finders-keepers.chinese.md
index 95c85c86ff..107b4d069f 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/finders-keepers.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/finders-keepers.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a6e40f1041b06c996f7b2406
 title: Finders Keepers
-isRequired: true
 challengeType: 5
 videoUrl: ''
 localeTitle: Finders Keepers
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/mutations.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/mutations.chinese.md
index cd10c9b4c8..e106a7d838 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/mutations.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/mutations.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: af2170cad53daa0770fabdea
 title: Mutations
-isRequired: true
 challengeType: 5
 videoUrl: ''
 localeTitle: 突变
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/repeat-a-string-repeat-a-string.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/repeat-a-string-repeat-a-string.chinese.md
index b06c70f00d..ca3aae3dab 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/repeat-a-string-repeat-a-string.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/repeat-a-string-repeat-a-string.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: afcc8d540bea9ea2669306b6
 title: Repeat a String Repeat a String
-isRequired: true
 challengeType: 5
 videoUrl: ''
 localeTitle: 重复一个字符串重复字符串
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/return-largest-numbers-in-arrays.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/return-largest-numbers-in-arrays.chinese.md
index 6028364da3..a49a06fb39 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/return-largest-numbers-in-arrays.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/return-largest-numbers-in-arrays.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a789b3483989747d63b0e427
 title: Return Largest Numbers in Arrays
-isRequired: true
 challengeType: 5
 videoUrl: ''
 localeTitle: 返回数组中的最大数字
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/reverse-a-string.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/reverse-a-string.chinese.md
index 4c22bb3cad..5c4016580f 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/reverse-a-string.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/reverse-a-string.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a202eed8fc186c8434cb6d61
 title: Reverse a String
-isRequired: true
 challengeType: 5
 videoUrl: ''
 localeTitle: 反转字符串
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/slice-and-splice.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/slice-and-splice.chinese.md
index d54c8acfd4..bcdecd4e3b 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/slice-and-splice.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/slice-and-splice.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: 579e2a2c335b9d72dd32e05c
 title: Slice and Splice
-isRequired: true
 isBeta: true
 challengeType: 5
 videoUrl: ''
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/title-case-a-sentence.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/title-case-a-sentence.chinese.md
index 68598a4ecb..16cea14505 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/title-case-a-sentence.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/title-case-a-sentence.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: ab6137d4e35944e21037b769
 title: Title Case a Sentence
-isRequired: true
 challengeType: 5
 videoUrl: ''
 localeTitle: 标题案例句子
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/truncate-a-string.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/truncate-a-string.chinese.md
index e8f9b44ff2..5f2d26202a 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/truncate-a-string.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/truncate-a-string.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: ac6993d51946422351508a41
 title: Truncate a String
-isRequired: true
 challengeType: 5
 videoUrl: ''
 localeTitle: 截断字符串
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/where-do-i-belong.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/where-do-i-belong.chinese.md
index b81588753b..cc3d0969b5 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/where-do-i-belong.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/where-do-i-belong.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a24c1a4622e3c05097f71d67
 title: Where do I Belong
-isRequired: true
 challengeType: 5
 videoUrl: ''
 localeTitle: 我属于哪里？
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/arguments-optional.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/arguments-optional.chinese.md
index 909f5bb354..b82702b75e 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/arguments-optional.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/arguments-optional.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a97fd23d9b809dac9921074f
 title: Arguments Optional
-isRequired: true
 challengeType: 5
 forumTopicId: 14271
 localeTitle: 可选参数
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/binary-agents.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/binary-agents.chinese.md
index 1206fc01cd..6c0ff17b7f 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/binary-agents.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/binary-agents.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a8d97bd4c764e91f9d2bda01
 title: Binary Agents
-isRequired: true
 challengeType: 5
 forumTopicId: 14273
 localeTitle: 二进制转化
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/convert-html-entities.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/convert-html-entities.chinese.md
index 483e300f38..ef16fc415d 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/convert-html-entities.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/convert-html-entities.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a6b0bb188d873cb2c8729495
 title: Convert HTML Entities
-isRequired: true
 challengeType: 5
 localeTitle: 转换HTML实体
 ---
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/diff-two-arrays.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/diff-two-arrays.chinese.md
index 07126cb22f..944ea61f07 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/diff-two-arrays.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/diff-two-arrays.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a5de63ebea8dbee56860f4f2
 title: Diff Two Arrays
-isRequired: true
 challengeType: 5
 forumTopicId: 16008
 localeTitle: 区分两个数组
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/dna-pairing.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/dna-pairing.chinese.md
index 774ea09256..ec64181602 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/dna-pairing.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/dna-pairing.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: afd15382cdfb22c9efe8b7de
 title: DNA Pairing
-isRequired: true
 challengeType: 5
 forumTopicId: 16009
 localeTitle: DNA 配对
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/drop-it.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/drop-it.chinese.md
index 4769e03666..baf8bc9364 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/drop-it.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/drop-it.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a5deed1811a43193f9f1c841
 title: Drop it
-isRequired: true
 challengeType: 5
 forumTopicId: 16010
 localeTitle: 筛选出数组中满足条件的元素
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/everything-be-true.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/everything-be-true.chinese.md
index 89879ce76c..d7dc7fe6b4 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/everything-be-true.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/everything-be-true.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a10d2431ad0c6a099a4b8b52
 title: Everything Be True
-isRequired: true
 challengeType: 5
 forumTopicId: 16011
 localeTitle: 真假值判断
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/missing-letters.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/missing-letters.chinese.md
index 6af2453457..36c76fae0f 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/missing-letters.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/missing-letters.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: af7588ade1100bde429baf20
 title: Missing letters
-isRequired: true
 challengeType: 5
 localeTitle: 丢失的字母
 ---
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/pig-latin.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/pig-latin.chinese.md
index 32dc83f539..08311df7fd 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/pig-latin.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/pig-latin.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: aa7697ea2477d1316795783b
 title: Pig Latin
-isRequired: true
 challengeType: 5
 forumTopicId: 16039
 localeTitle: 儿童黑话
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/search-and-replace.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/search-and-replace.chinese.md
index 390be8d9bf..0ca0d4f3d2 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/search-and-replace.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/search-and-replace.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a0b5010f579e69b815e7c5d6
 title: Search and Replace
-isRequired: true
 challengeType: 5
 forumTopicId: 16045
 localeTitle: 搜索和替换
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/seek-and-destroy.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/seek-and-destroy.chinese.md
index 63966d7fd8..06f75ff3af 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/seek-and-destroy.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/seek-and-destroy.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a39963a4c10bc8b4d4f06d7e
 title: Seek and Destroy
-isRequired: true
 challengeType: 5
 forumTopicId: 16046
 localeTitle: 瞄准和消灭
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/smallest-common-multiple.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/smallest-common-multiple.chinese.md
index 4836e7eeed..d114595bdc 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/smallest-common-multiple.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/smallest-common-multiple.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: ae9defd7acaf69703ab432ea
 title: Smallest Common Multiple
-isRequired: true
 challengeType: 5
 forumTopicId: 16075
 localeTitle: 最小公倍数
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sorted-union.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sorted-union.chinese.md
index d405d47d30..b5cf2b8be0 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sorted-union.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sorted-union.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a105e963526e7de52b219be9
 title: Sorted Union
-isRequired: true
 challengeType: 5
 forumTopicId: 16077
 localeTitle: 集合排序
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/spinal-tap-case.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/spinal-tap-case.chinese.md
index 5ef600568b..ea81e98120 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/spinal-tap-case.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/spinal-tap-case.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a103376db3ba46b2d50db289
 title: Spinal Tap Case
-isRequired: true
 challengeType: 5
 forumTopicId: 16078
 localeTitle: 短线连接格式
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/steamroller.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/steamroller.chinese.md
index c665b7e9fb..15daed8a63 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/steamroller.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/steamroller.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: ab306dbdcc907c7ddfc30830
 title: Steamroller
-isRequired: true
 challengeType: 5
 forumTopicId: 16079
 localeTitle: 扁平化
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-numbers-in-a-range.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-numbers-in-a-range.chinese.md
index 1337581145..e97d64d29b 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-numbers-in-a-range.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-numbers-in-a-range.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a3566b1109230028080c9345
 title: Sum All Numbers in a Range
-isRequired: true
 challengeType: 5
 forumTopicId: 16083
 localeTitle: 范围内的数字求和
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-odd-fibonacci-numbers.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-odd-fibonacci-numbers.chinese.md
index 357932ddca..641ddb0c0f 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-odd-fibonacci-numbers.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-odd-fibonacci-numbers.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a5229172f011153519423690
 title: Sum All Odd Fibonacci Numbers
-isRequired: true
 challengeType: 5
 forumTopicId: 16084
 localeTitle: 求斐波那契数组中的奇数之和
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-primes.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-primes.chinese.md
index 92e954dc55..3676628c06 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-primes.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/sum-all-primes.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a3bfc1673c0526e06d3ac698
 title: Sum All Primes
-isRequired: true
 challengeType: 5
 forumTopicId: 16085
 localeTitle: 对所有素数求和
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/wherefore-art-thou.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/wherefore-art-thou.chinese.md
index ef6a013c1f..fcc7e23f26 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/wherefore-art-thou.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/intermediate-algorithm-scripting/wherefore-art-thou.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a8e512fbe388ac2f9198f0fa
 title: Wherefore art thou
-isRequired: true
 challengeType: 5
 forumTopicId: 16092
 localeTitle: 罗密欧与朱丽叶
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/caesars-cipher.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/caesars-cipher.chinese.md
index c8a02e0603..59f7e5821d 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/caesars-cipher.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/caesars-cipher.chinese.md
@@ -2,7 +2,6 @@
 id: 56533eb9ac21ba0edf2244e2
 title: Caesars Cipher
 challengeType: 5
-isRequired: true
 forumTopicId: 16003
 localeTitle: 凯撒密码
 ---
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/cash-register.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/cash-register.chinese.md
index 210dce1676..e0895f9c97 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/cash-register.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/cash-register.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: aa2e6f85cab2ab736c9a9b24
 title: Cash Register
-isRequired: true
 challengeType: 5
 forumTopicId: 16012
 localeTitle: 收银机
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/palindrome-checker.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/palindrome-checker.chinese.md
index aa2e1178ec..09a41969ff 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/palindrome-checker.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/palindrome-checker.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: aaa48de84e1ecc7c742e1124
 title: Palindrome Checker
-isRequired: true
 challengeType: 5
 forumTopicId: 16004
 localeTitle: 回文检查器
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/roman-numeral-converter.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/roman-numeral-converter.chinese.md
index 1cfb882738..ca09556a9c 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/roman-numeral-converter.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/roman-numeral-converter.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: a7f4d8f2483413a6ce226cac
 title: Roman Numeral Converter
-isRequired: true
 challengeType: 5
 forumTopicId: 16044
 localeTitle: 罗马数字转换器
diff --git a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator.chinese.md b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator.chinese.md
index f24e5179be..a96ea0f751 100644
--- a/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator.chinese.md
+++ b/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/telephone-number-validator.chinese.md
@@ -2,7 +2,6 @@
 id: aff0395860f5d3034dc0bfc9
 title: Telephone Number Validator
 challengeType: 5
-isRequired: true
 forumTopicId: 16090
 localeTitle: 电话号码验证器
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-25-5-clock.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-25-5-clock.chinese.md
index 3066a85be3..f016989631 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-25-5-clock.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-25-5-clock.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7158d8c442eddfaeb5bd0f
 title: Build a 25 + 5 Clock
-isRequired: true
 challengeType: 3
 forumTopicId: 301373
 localeTitle: 构建一个番茄时钟
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-drum-machine.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-drum-machine.chinese.md
index 61ffdf73f3..bdb5212ec2 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-drum-machine.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-drum-machine.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: 587d7dbc367417b2b2512bae
 title: Build a Drum Machine
-isRequired: true
 challengeType: 3
 forumTopicId: 301370
 localeTitle: 构建一台鼓式机器
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-javascript-calculator.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-javascript-calculator.chinese.md
index 52ac603e8c..961c48eefd 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-javascript-calculator.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-javascript-calculator.chinese.md
@@ -2,7 +2,6 @@
 id: bd7158d8c442eddfaeb5bd17
 title: Build a JavaScript Calculator
 challengeType: 3
-isRequired: true
 forumTopicId: 301371
 localeTitle: 构建一个 JavaScript 计算器
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-markdown-previewer.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-markdown-previewer.chinese.md
index 6668baaac9..712d337b5c 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-markdown-previewer.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-markdown-previewer.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7157d8c242eddfaeb5bd13
 title: Build a Markdown Previewer
-isRequired: true
 challengeType: 3
 forumTopicId: 301372
 localeTitle: 构建一个 Markdown 文件预览器
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-random-quote-machine.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-random-quote-machine.chinese.md
index 051e20a524..5248140b93 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-random-quote-machine.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/front-end-libraries-projects/build-a-random-quote-machine.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7158d8c442eddfaeb5bd13
 title: Build a Random Quote Machine
-isRequired: true
 challengeType: 3
 localeTitle: 构建一个随机引语生成器
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/connect-redux-to-react.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/connect-redux-to-react.chinese.md
index 0672e8fb9a..c92f729e94 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/connect-redux-to-react.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/connect-redux-to-react.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036147
 title: Connect Redux to React
 challengeType: 6
-isRequired: false
 forumTopicId: 301426
 localeTitle: 连接 Redux 和 React
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/connect-redux-to-the-messages-app.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/connect-redux-to-the-messages-app.chinese.md
index 7e3b003be3..0395a5a160 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/connect-redux-to-the-messages-app.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/connect-redux-to-the-messages-app.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036148
 title: Connect Redux to the Messages App
 challengeType: 6
-isRequired: false
 forumTopicId: 301427
 localeTitle: 将 Redux 连接到 Messages App
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/extract-local-state-into-redux.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/extract-local-state-into-redux.chinese.md
index f266074318..33109c9627 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/extract-local-state-into-redux.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/extract-local-state-into-redux.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036149
 title: Extract Local State into Redux
 challengeType: 6
-isRequired: false
 forumTopicId: 301428
 localeTitle: 将局部状态提取到 Redux 中
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/extract-state-logic-to-redux.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/extract-state-logic-to-redux.chinese.md
index 1fe03d4bc5..bec5c068a1 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/extract-state-logic-to-redux.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/extract-state-logic-to-redux.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036143
 title: Extract State Logic to Redux
 challengeType: 6
-isRequired: false
 forumTopicId: 301429
 localeTitle: 提取状态逻辑给 Redux
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/getting-started-with-react-redux.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/getting-started-with-react-redux.chinese.md
index d60f70d71b..79dad2eecc 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/getting-started-with-react-redux.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/getting-started-with-react-redux.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036141
 title: Getting Started with React Redux
 challengeType: 6
-isRequired: false
 forumTopicId: 301430
 localeTitle: React 和 Redux 入门
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/manage-state-locally-first.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/manage-state-locally-first.chinese.md
index ff47176a5e..acccbc814e 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/manage-state-locally-first.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/manage-state-locally-first.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036142
 title: Manage State Locally First
 challengeType: 6
-isRequired: false
 forumTopicId: 301431
 localeTitle: 首先在本地管理状态
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/map-dispatch-to-props.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/map-dispatch-to-props.chinese.md
index a661cc16a9..93d0850bdd 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/map-dispatch-to-props.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/map-dispatch-to-props.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036146
 title: Map Dispatch to Props
 challengeType: 6
-isRequired: false
 forumTopicId: 301432
 localeTitle: 映射 Dispatch 到 Props
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/map-state-to-props.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/map-state-to-props.chinese.md
index dfda45ebc1..23da93da20 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/map-state-to-props.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/map-state-to-props.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036145
 title: Map State to Props
 challengeType: 6
-isRequired: false
 forumTopicId: 301433
 localeTitle: 映射 State 到 Props
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/moving-forward-from-here.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/moving-forward-from-here.chinese.md
index bd28af733a..90079dcf32 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/moving-forward-from-here.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/moving-forward-from-here.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403614a
 title: Moving Forward From Here
 challengeType: 6
-isRequired: false
 forumTopicId: 301434
 localeTitle: 从这里前进
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/use-provider-to-connect-redux-to-react.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/use-provider-to-connect-redux-to-react.chinese.md
index 1cea322087..ae7ba29dee 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/use-provider-to-connect-redux-to-react.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react-and-redux/use-provider-to-connect-redux-to-react.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036144
 title: Use Provider to Connect Redux to React
 challengeType: 6
-isRequired: false
 forumTopicId: 301435
 localeTitle: 使用 Provider 连接 Redux 和 React
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/access-props-using-this.props.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/access-props-using-this.props.chinese.md
index 9c0c15d542..436547987a 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/access-props-using-this.props.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/access-props-using-this.props.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403616e
 title: Access Props Using this.props
 challengeType: 6
-isRequired: false
 forumTopicId: 301375
 localeTitle: 使用 this.props 访问 Props
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/add-comments-in-jsx.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/add-comments-in-jsx.chinese.md
index 49c796ffe9..0a1767d353 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/add-comments-in-jsx.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/add-comments-in-jsx.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24bbe0dba28a8d3cbd4c5e
 title: Add Comments in JSX
 challengeType: 6
-isRequired: false
 forumTopicId: 301376
 localeTitle: 在 JSX 中添加注释
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/add-event-listeners.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/add-event-listeners.chinese.md
index 16670577a1..2dc869bb11 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/add-event-listeners.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/add-event-listeners.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403617e
 title: Add Event Listeners
 challengeType: 6
-isRequired: false
 forumTopicId: 301377
 localeTitle: 添加事件侦听器
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/add-inline-styles-in-react.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/add-inline-styles-in-react.chinese.md
index a2d0ff4f0e..9a98b0587a 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/add-inline-styles-in-react.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/add-inline-styles-in-react.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036182
 title: Add Inline Styles in React
 challengeType: 6
-isRequired: false
 forumTopicId: 301378
 localeTitle: 在 React 中添加内联样式
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/bind-this-to-a-class-method.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/bind-this-to-a-class-method.chinese.md
index 80e06b823a..a0f53a1f57 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/bind-this-to-a-class-method.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/bind-this-to-a-class-method.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036174
 title: Bind 'this' to a Class Method
 challengeType: 6
-isRequired: false
 forumTopicId: 301379
 localeTitle: 将 this 绑定到 Class 方法
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/change-inline-css-conditionally-based-on-component-state.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/change-inline-css-conditionally-based-on-component-state.chinese.md
index 786b36ca4d..c1a31a6590 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/change-inline-css-conditionally-based-on-component-state.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/change-inline-css-conditionally-based-on-component-state.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036189
 title: Change Inline CSS Conditionally Based on Component State
 challengeType: 6
-isRequired: false
 forumTopicId: 301380
 localeTitle: 根据组件状态有条件地更改内联 CSS
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/compose-react-components.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/compose-react-components.chinese.md
index 2465c2bd99..4d53856c95 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/compose-react-components.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/compose-react-components.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036166
 title: Compose React Components
 challengeType: 6
-isRequired: false
 forumTopicId: 301381
 localeTitle: 组合 React 组件
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-complex-jsx-element.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-complex-jsx-element.chinese.md
index 67f38c8caa..a6562fd749 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-complex-jsx-element.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-complex-jsx-element.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24bbe0dba28a8d3cbd4c5d
 title: Create a Complex JSX Element
 challengeType: 6
-isRequired: false
 forumTopicId: 301382
 localeTitle: 创建一个复杂的 JSX 元素
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-component-with-composition.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-component-with-composition.chinese.md
index 8db9c681a9..324ca3b93b 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-component-with-composition.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-component-with-composition.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036164
 title: Create a Component with Composition
 challengeType: 6
-isRequired: false
 forumTopicId: 301383
 localeTitle: 用组合的方式创建一个 React 组件 
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-controlled-form.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-controlled-form.chinese.md
index b1a5ad8e9d..34ddb7a28c 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-controlled-form.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-controlled-form.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036179
 title: Create a Controlled Form
 challengeType: 6
-isRequired: false
 forumTopicId: 301384
 localeTitle: 创建一个可以控制的表单
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-controlled-input.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-controlled-input.chinese.md
index 0351bbb85b..c883170136 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-controlled-input.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-controlled-input.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036178
 title: Create a Controlled Input
 challengeType: 6
-isRequired: false
 forumTopicId: 301385
 localeTitle: 创建一个可以控制的输入框
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-react-component.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-react-component.chinese.md
index 552fc55893..7faaa7eccb 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-react-component.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-react-component.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036163
 title: Create a React Component
 challengeType: 6
-isRequired: false
 forumTopicId: 301386
 localeTitle: 创建一个 React 组件
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-simple-jsx-element.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-simple-jsx-element.chinese.md
index 639de1cd24..243b9a84ea 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-simple-jsx-element.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-simple-jsx-element.chinese.md
@@ -2,7 +2,6 @@
 id: 587d7dbc367417b2b2512bb1
 title: Create a Simple JSX Element
 challengeType: 6
-isRequired: false
 forumTopicId: 301390
 localeTitle: 创建一个简单的 JSX 元素
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-stateful-component.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-stateful-component.chinese.md
index 06159546df..dfcf3dbfa9 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-stateful-component.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-stateful-component.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036170
 title: Create a Stateful Component
 challengeType: 6
-isRequired: false
 forumTopicId: 301391
 localeTitle: 创建一个有状态的组件
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-stateless-functional-component.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-stateless-functional-component.chinese.md
index 9cdd4c1a4d..308e6a2d17 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-stateless-functional-component.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/create-a-stateless-functional-component.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036162
 title: Create a Stateless Functional Component
 challengeType: 6
-isRequired: false
 forumTopicId: 301392
 localeTitle: 创建一个无状态的函数组件
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/define-an-html-class-in-jsx.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/define-an-html-class-in-jsx.chinese.md
index db81f1f309..c33652c859 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/define-an-html-class-in-jsx.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/define-an-html-class-in-jsx.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036160
 title: Define an HTML Class in JSX
 challengeType: 6
-isRequired: false
 forumTopicId: 301393
 localeTitle: 在 JSX 中定义一个 HTML Class
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/give-sibling-elements-a-unique-key-attribute.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/give-sibling-elements-a-unique-key-attribute.chinese.md
index bba7a998e9..d02286f2ec 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/give-sibling-elements-a-unique-key-attribute.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/give-sibling-elements-a-unique-key-attribute.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403618b
 title: Give Sibling Elements a Unique Key Attribute
 challengeType: 6
-isRequired: false
 forumTopicId: 301394
 localeTitle: 给同级元素一个唯一的键属性
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/introducing-inline-styles.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/introducing-inline-styles.chinese.md
index 4a7f85ebc6..5532f94b7b 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/introducing-inline-styles.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/introducing-inline-styles.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036181
 title: Introducing Inline Styles
 challengeType: 6
-isRequired: false
 forumTopicId: 301395
 localeTitle: 介绍内联样式
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/learn-about-self-closing-jsx-tags.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/learn-about-self-closing-jsx-tags.chinese.md
index 50b7cc94fa..33d844cb29 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/learn-about-self-closing-jsx-tags.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/learn-about-self-closing-jsx-tags.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036161
 title: Learn About Self-Closing JSX Tags
 challengeType: 6
-isRequired: false
 forumTopicId: 301396
 localeTitle: 了解自动闭合的 JSX 标记
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/optimize-re-renders-with-shouldcomponentupdate.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/optimize-re-renders-with-shouldcomponentupdate.chinese.md
index d5450be658..03409f2da7 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/optimize-re-renders-with-shouldcomponentupdate.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/optimize-re-renders-with-shouldcomponentupdate.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036180
 title: Optimize Re-Renders with shouldComponentUpdate
 challengeType: 6
-isRequired: false
 forumTopicId: 301398
 localeTitle: 使用 shouldComponentUpdate 优化重新渲染
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/override-default-props.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/override-default-props.chinese.md
index 84014d09ba..3c0fafe614 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/override-default-props.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/override-default-props.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403616c
 title: Override Default Props
 challengeType: 6
-isRequired: false
 forumTopicId: 301399
 localeTitle: 覆盖默认的 Props
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/pass-a-callback-as-props.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/pass-a-callback-as-props.chinese.md
index e3a012e3ab..d88d8018ff 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/pass-a-callback-as-props.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/pass-a-callback-as-props.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403617b
 title: Pass a Callback as Props
 challengeType: 6
-isRequired: false
 forumTopicId: 301400
 localeTitle: 传递回调作为 Props
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/pass-an-array-as-props.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/pass-an-array-as-props.chinese.md
index ca712c8262..ffb7d9f4be 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/pass-an-array-as-props.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/pass-an-array-as-props.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403616a
 title: Pass an Array as Props
 challengeType: 6
-isRequired: false
 forumTopicId: 301401
 localeTitle: 传递一个数组作为 Props
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/pass-props-to-a-stateless-functional-component.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/pass-props-to-a-stateless-functional-component.chinese.md
index 107898c623..9d7791efcd 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/pass-props-to-a-stateless-functional-component.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/pass-props-to-a-stateless-functional-component.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036169
 title: Pass Props to a Stateless Functional Component
 challengeType: 6
-isRequired: false
 forumTopicId: 301402
 localeTitle: 将 Props 传递给无状态函数组件
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/pass-state-as-props-to-child-components.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/pass-state-as-props-to-child-components.chinese.md
index 42bc1ff405..1356c60758 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/pass-state-as-props-to-child-components.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/pass-state-as-props-to-child-components.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403617a
 title: Pass State as Props to Child Components
 challengeType: 6
-isRequired: false
 forumTopicId: 301403
 localeTitle: 将 State 作为 Props 传递给子组件
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/render-a-class-component-to-the-dom.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/render-a-class-component-to-the-dom.chinese.md
index 66212c6627..741514f06f 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/render-a-class-component-to-the-dom.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/render-a-class-component-to-the-dom.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036167
 title: Render a Class Component to the DOM
 challengeType: 6
-isRequired: false
 forumTopicId: 301404
 localeTitle: 渲染 class 组件为 Dom 树
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/render-conditionally-from-props.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/render-conditionally-from-props.chinese.md
index 47cb4f41d2..2b0d5a2188 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/render-conditionally-from-props.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/render-conditionally-from-props.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036188
 title: Render Conditionally from Props
 challengeType: 6
-isRequired: false
 forumTopicId: 301405
 localeTitle: 根据 Props 有条件地渲染
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/render-html-elements-to-the-dom.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/render-html-elements-to-the-dom.chinese.md
index 7d4e0fc0af..4cb6a3078b 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/render-html-elements-to-the-dom.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/render-html-elements-to-the-dom.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24bbe0dba28a8d3cbd4c5f
 title: Render HTML Elements to the DOM
 challengeType: 6
-isRequired: false
 forumTopicId: 301406
 localeTitle: 渲染 HTML 元素为 DOM 树
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/render-react-on-the-server-with-rendertostring.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/render-react-on-the-server-with-rendertostring.chinese.md
index 5aff452845..4a3e97c186 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/render-react-on-the-server-with-rendertostring.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/render-react-on-the-server-with-rendertostring.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403618d
 title: Render React on the Server with renderToString
 challengeType: 6
-isRequired: false
 forumTopicId: 301407
 localeTitle: 用 renderToString 在服务器上渲染 React
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/render-state-in-the-user-interface-another-way.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/render-state-in-the-user-interface-another-way.chinese.md
index d8ff2f120b..b8c55be53a 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/render-state-in-the-user-interface-another-way.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/render-state-in-the-user-interface-another-way.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036172
 title: Render State in the User Interface Another Way
 challengeType: 6
-isRequired: false
 forumTopicId: 301408
 localeTitle: 以另一种方式在用户界面中渲染状态
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/render-state-in-the-user-interface.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/render-state-in-the-user-interface.chinese.md
index 3ada3ddf4e..0312cd5801 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/render-state-in-the-user-interface.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/render-state-in-the-user-interface.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036171
 title: Render State in the User Interface
 challengeType: 6
-isRequired: false
 forumTopicId: 301409
 localeTitle: 在用户界面中渲染状态
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/render-with-an-if-else-condition.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/render-with-an-if-else-condition.chinese.md
index c51a600153..a70d6aa8ef 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/render-with-an-if-else-condition.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/render-with-an-if-else-condition.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036184
 title: Render with an If-Else Condition
 challengeType: 6
-isRequired: false
 forumTopicId: 301410
 localeTitle: 使用 If-Else 条件进行渲染
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/review-using-props-with-stateless-functional-components.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/review-using-props-with-stateless-functional-components.chinese.md
index bf49ad39dd..c4f1ad918c 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/review-using-props-with-stateless-functional-components.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/review-using-props-with-stateless-functional-components.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403616f
 title: Review Using Props with Stateless Functional Components
 challengeType: 6
-isRequired: false
 forumTopicId: 301411
 localeTitle: 复习如何使用 Props 和无状态函数组件
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/set-state-with-this.setstate.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/set-state-with-this.setstate.chinese.md
index fe179a9862..0b1fd1840f 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/set-state-with-this.setstate.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/set-state-with-this.setstate.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036173
 title: Set State with this.setState
 challengeType: 6
-isRequired: false
 forumTopicId: 301412
 localeTitle: 用 this.setState 设置状态
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/use--for-a-more-concise-conditional.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/use--for-a-more-concise-conditional.chinese.md
index 70fb1b95c5..bcb306cbe1 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/use--for-a-more-concise-conditional.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/use--for-a-more-concise-conditional.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036185
 title: Use && for a More Concise Conditional
 challengeType: 6
-isRequired: false
 forumTopicId: 301413
 localeTitle: 使用 && 获得更简洁的条件
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/use-a-ternary-expression-for-conditional-rendering.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/use-a-ternary-expression-for-conditional-rendering.chinese.md
index e919f9324b..cf3136f0b9 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/use-a-ternary-expression-for-conditional-rendering.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/use-a-ternary-expression-for-conditional-rendering.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036187
 title: Use a Ternary Expression for Conditional Rendering
 challengeType: 6
-isRequired: false
 forumTopicId: 301414
 localeTitle: 使用三元表达式进行条件渲染
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/use-advanced-javascript-in-react-render-method.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/use-advanced-javascript-in-react-render-method.chinese.md
index 47a6d5a186..9aea72c419 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/use-advanced-javascript-in-react-render-method.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/use-advanced-javascript-in-react-render-method.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036183
 title: Use Advanced JavaScript in React Render Method
 challengeType: 6
-isRequired: false
 forumTopicId: 301415
 localeTitle: 在 React Render 方法中使用 JavaScript
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/use-array.filter-to-dynamically-filter-an-array.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/use-array.filter-to-dynamically-filter-an-array.chinese.md
index 05eff521e4..53d7bdc79b 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/use-array.filter-to-dynamically-filter-an-array.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/use-array.filter-to-dynamically-filter-an-array.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403618c
 title: Use Array.filter() to Dynamically Filter an Array
 challengeType: 6
-isRequired: false
 forumTopicId: 301416
 localeTitle: 使用 Array.Filter() 动态过滤数组
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/use-array.map-to-dynamically-render-elements.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/use-array.map-to-dynamically-render-elements.chinese.md
index dffff66b70..39c1ab26e6 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/use-array.map-to-dynamically-render-elements.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/use-array.map-to-dynamically-render-elements.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403618a
 title: Use Array.map() to Dynamically Render Elements
 challengeType: 6
-isRequired: false
 forumTopicId: 301417
 localeTitle: 使用 Array.map() 动态渲染元素
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/use-default-props.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/use-default-props.chinese.md
index e6987662b4..703a6011e0 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/use-default-props.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/use-default-props.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403616b
 title: Use Default Props
 challengeType: 6
-isRequired: false
 forumTopicId: 301418
 localeTitle: 使用默认的 Props
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/use-proptypes-to-define-the-props-you-expect.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/use-proptypes-to-define-the-props-you-expect.chinese.md
index cedb727610..a79c4ec316 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/use-proptypes-to-define-the-props-you-expect.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/use-proptypes-to-define-the-props-you-expect.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403616d
 title: Use PropTypes to Define the Props You Expect
 challengeType: 6
-isRequired: false
 forumTopicId: 301419
 localeTitle: 使用 PropTypes 来定义你期望的 Props
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/use-react-to-render-nested-components.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/use-react-to-render-nested-components.chinese.md
index 3984ea4b18..79f7d8d8eb 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/use-react-to-render-nested-components.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/use-react-to-render-nested-components.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036165
 title: Use React to Render Nested Components
 challengeType: 6
-isRequired: false
 forumTopicId: 301420
 localeTitle: 使用 React 渲染嵌套组件
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/use-state-to-toggle-an-element.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/use-state-to-toggle-an-element.chinese.md
index b46c4dbbc9..676769d5cc 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/use-state-to-toggle-an-element.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/use-state-to-toggle-an-element.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036176
 title: Use State to Toggle an Element
 challengeType: 6
-isRequired: false
 forumTopicId: 301421
 localeTitle: 使用 State 切换元素
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/use-the-lifecycle-method-componentdidmount.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/use-the-lifecycle-method-componentdidmount.chinese.md
index 9d1d6cdad1..51aaad60f7 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/use-the-lifecycle-method-componentdidmount.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/use-the-lifecycle-method-componentdidmount.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403617d
 title: Use the Lifecycle Method componentDidMount
 challengeType: 6
-isRequired: false
 forumTopicId: 301422
 localeTitle: 使用生命周期方法：componentDidMount
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/use-the-lifecycle-method-componentwillmount.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/use-the-lifecycle-method-componentwillmount.chinese.md
index 06088ec837..e35db4d73d 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/use-the-lifecycle-method-componentwillmount.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/use-the-lifecycle-method-componentwillmount.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403617c
 title: Use the Lifecycle Method componentWillMount
 challengeType: 6
-isRequired: false
 forumTopicId: 301423
 localeTitle: 使用生命周期方法：componentWillMount
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/write-a-react-component-from-scratch.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/write-a-react-component-from-scratch.chinese.md
index 10e7ecf914..00f35d7da0 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/write-a-react-component-from-scratch.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/write-a-react-component-from-scratch.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036168
 title: Write a React Component from Scratch
 challengeType: 6
-isRequired: false
 forumTopicId: 301424
 localeTitle: 从零开始写一个 React 组件
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/react/write-a-simple-counter.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/react/write-a-simple-counter.chinese.md
index 56d352a6b7..2848a2d128 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/react/write-a-simple-counter.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/react/write-a-simple-counter.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036177
 title: Write a Simple Counter
 challengeType: 6
-isRequired: false
 forumTopicId: 301425
 localeTitle: 写一个简单的计数器
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/combine-multiple-reducers.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/combine-multiple-reducers.chinese.md
index 0805952417..f39f5d93ed 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/combine-multiple-reducers.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/combine-multiple-reducers.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036154
 title: Combine Multiple Reducers
 challengeType: 6
-isRequired: false
 forumTopicId: 301436
 localeTitle: 组合多个 Reduces
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/copy-an-object-with-object.assign.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/copy-an-object-with-object.assign.chinese.md
index def9a470ba..9f86254c40 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/copy-an-object-with-object.assign.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/copy-an-object-with-object.assign.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403615b
 title: Copy an Object with Object.assign
 challengeType: 6
-isRequired: false
 forumTopicId: 301437
 localeTitle: 使用 Object.assign 拷贝对象
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/create-a-redux-store.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/create-a-redux-store.chinese.md
index ff6d7c3a4e..dd231dc47b 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/create-a-redux-store.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/create-a-redux-store.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403614b
 title: Create a Redux Store
 challengeType: 6
-isRequired: false
 forumTopicId: 301439
 localeTitle: 创建一个 Redux Store
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/define-a-redux-action.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/define-a-redux-action.chinese.md
index 4ec6ab7bf2..4213218a52 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/define-a-redux-action.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/define-a-redux-action.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403614d
 title: Define a Redux Action
 challengeType: 6
-isRequired: false
 forumTopicId: 301440
 localeTitle: 定义一个 Redux Action
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/define-an-action-creator.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/define-an-action-creator.chinese.md
index b7339dec6a..a69dc18b68 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/define-an-action-creator.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/define-an-action-creator.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403614e
 title: Define an Action Creator
 challengeType: 6
-isRequired: false
 forumTopicId: 301441
 localeTitle: 定义一个 Action Creator
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/dispatch-an-action-event.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/dispatch-an-action-event.chinese.md
index b17afb749e..cc3d6d7ce2 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/dispatch-an-action-event.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/dispatch-an-action-event.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403614f
 title: Dispatch an Action Event
 challengeType: 6
-isRequired: false
 forumTopicId: 301442
 localeTitle: 分发 Action Event
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/get-state-from-the-redux-store.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/get-state-from-the-redux-store.chinese.md
index 1027e0b03e..448c41ca1a 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/get-state-from-the-redux-store.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/get-state-from-the-redux-store.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403614c
 title: Get State from the Redux Store
 challengeType: 6
-isRequired: false
 forumTopicId: 301443
 localeTitle: 从 Redux Store 获取状态
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/handle-an-action-in-the-store.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/handle-an-action-in-the-store.chinese.md
index 97fb684519..ea671e8556 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/handle-an-action-in-the-store.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/handle-an-action-in-the-store.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036150
 title: Handle an Action in the Store
 challengeType: 6
-isRequired: false
 forumTopicId: 301444
 localeTitle: 在 Store 里处理 Action
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/never-mutate-state.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/never-mutate-state.chinese.md
index dc5dab3e99..736a3f33ca 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/never-mutate-state.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/never-mutate-state.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036158
 title: Never Mutate State
 challengeType: 6
-isRequired: false
 forumTopicId: 301445
 localeTitle: 永不改变状态
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/register-a-store-listener.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/register-a-store-listener.chinese.md
index 2cdbfe8bc2..69c7a4b7f1 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/register-a-store-listener.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/register-a-store-listener.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036153
 title: Register a Store Listener
 challengeType: 6
-isRequired: false
 forumTopicId: 301446
 localeTitle: 注册 Store 监听器
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/remove-an-item-from-an-array.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/remove-an-item-from-an-array.chinese.md
index 545e800b52..e4db5b9a33 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/remove-an-item-from-an-array.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/remove-an-item-from-an-array.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d403615a
 title: Remove an Item from an Array
 challengeType: 6
-isRequired: false
 forumTopicId: 301447
 localeTitle: 从数组中删除项目
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/send-action-data-to-the-store.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/send-action-data-to-the-store.chinese.md
index 4f99de8b51..6f0e0d7597 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/send-action-data-to-the-store.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/send-action-data-to-the-store.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036155
 title: Send Action Data to the Store
 challengeType: 6
-isRequired: false
 forumTopicId: 301448
 localeTitle: 发送 Action Data 给 Store
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/use-a-switch-statement-to-handle-multiple-actions.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/use-a-switch-statement-to-handle-multiple-actions.chinese.md
index 7f37d6a8ff..b5916a9fbf 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/use-a-switch-statement-to-handle-multiple-actions.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/use-a-switch-statement-to-handle-multiple-actions.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036151
 title: Use a Switch Statement to Handle Multiple Actions
 challengeType: 6
-isRequired: false
 forumTopicId: 301449
 localeTitle: 使用 Switch 语句处理多个 Actions
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/use-const-for-action-types.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/use-const-for-action-types.chinese.md
index 2ce00f0443..5e1e68ae8d 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/use-const-for-action-types.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/use-const-for-action-types.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036152
 title: Use const for Action Types
 challengeType: 6
-isRequired: false
 forumTopicId: 301450
 localeTitle: 使用 const 声明 Action Types
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/use-middleware-to-handle-asynchronous-actions.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/use-middleware-to-handle-asynchronous-actions.chinese.md
index 51bda524c2..0ffa23d144 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/use-middleware-to-handle-asynchronous-actions.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/use-middleware-to-handle-asynchronous-actions.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036156
 title: Use Middleware to Handle Asynchronous Actions
 challengeType: 6
-isRequired: false
 forumTopicId: 301451
 localeTitle: 使用中间件处理异步操作
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/use-the-spread-operator-on-arrays.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/use-the-spread-operator-on-arrays.chinese.md
index cc67f32e2d..63ee36a029 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/use-the-spread-operator-on-arrays.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/use-the-spread-operator-on-arrays.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036159
 title: Use the Spread Operator on Arrays
 challengeType: 6
-isRequired: false
 forumTopicId: 301452
 localeTitle: 在数组中使用扩展运算符
 ---
diff --git a/curriculum/challenges/chinese/03-front-end-libraries/redux/write-a-counter-with-redux.chinese.md b/curriculum/challenges/chinese/03-front-end-libraries/redux/write-a-counter-with-redux.chinese.md
index 1d87eb44dd..44a1331f5d 100644
--- a/curriculum/challenges/chinese/03-front-end-libraries/redux/write-a-counter-with-redux.chinese.md
+++ b/curriculum/challenges/chinese/03-front-end-libraries/redux/write-a-counter-with-redux.chinese.md
@@ -2,7 +2,6 @@
 id: 5a24c314108439a4d4036157
 title: Write a Counter with Redux
 challengeType: 6
-isRequired: false
 forumTopicId: 301453
 localeTitle: 用 Redux 写一个计数器
 ---
diff --git a/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-bar-chart.chinese.md b/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-bar-chart.chinese.md
index ad1c420b5c..802272afd3 100644
--- a/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-bar-chart.chinese.md
+++ b/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-bar-chart.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7168d8c242eddfaeb5bd13
 title: Visualize Data with a Bar Chart
-isRequired: true
 challengeType: 3
 forumTopicId: 301464
 localeTitle: 用条形图可视化数据
diff --git a/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-choropleth-map.chinese.md b/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-choropleth-map.chinese.md
index 02b9ac599f..eee740bb1a 100644
--- a/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-choropleth-map.chinese.md
+++ b/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-choropleth-map.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: 587d7fa6367417b2b2512bbf
 title: Visualize Data with a Choropleth Map
-isRequired: true
 challengeType: 3
 forumTopicId: 301465
 localeTitle: 用地区分布图可视化数据
diff --git a/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-heat-map.chinese.md b/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-heat-map.chinese.md
index 8878b6a82b..19d2ffd2ff 100644
--- a/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-heat-map.chinese.md
+++ b/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-heat-map.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7188d8c242eddfaeb5bd13
 title: Visualize Data with a Heat Map
-isRequired: true
 challengeType: 3
 forumTopicId: 301466
 localeTitle: 用热图可视化数据
diff --git a/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-scatterplot-graph.chinese.md b/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-scatterplot-graph.chinese.md
index daf8e4ce0d..0c107cad2a 100644
--- a/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-scatterplot-graph.chinese.md
+++ b/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-scatterplot-graph.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7178d8c242eddfaeb5bd13
 title: Visualize Data with a Scatterplot Graph
-isRequired: true
 challengeType: 3
 forumTopicId: 301467
 localeTitle: 用散点图可视化数据
diff --git a/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-treemap-diagram.chinese.md b/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-treemap-diagram.chinese.md
index 714bb100f5..ca23555468 100644
--- a/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-treemap-diagram.chinese.md
+++ b/curriculum/challenges/chinese/04-data-visualization/data-visualization-projects/visualize-data-with-a-treemap-diagram.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: 587d7fa6367417b2b2512bc0
 title: Visualize Data with a Treemap Diagram
-isRequired: true
 challengeType: 3
 forumTopicId: 301468
 localeTitle: 用树形图可视化数据
diff --git a/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/exercise-tracker.chinese.md b/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/exercise-tracker.chinese.md
index 1c5f2f867f..d51d9be7eb 100644
--- a/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/exercise-tracker.chinese.md
+++ b/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/exercise-tracker.chinese.md
@@ -3,7 +3,6 @@ id: 5a8b073d06fa14fcfde687aa
 title: Exercise Tracker
 challengeType: 4
 isHidden: false
-isRequired: true
 forumTopicId: 301505
 localeTitle: 运动跟踪器
 ---
diff --git a/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/file-metadata-microservice.chinese.md b/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/file-metadata-microservice.chinese.md
index facdf827df..9577978d03 100644
--- a/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/file-metadata-microservice.chinese.md
+++ b/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/file-metadata-microservice.chinese.md
@@ -3,7 +3,6 @@ id: bd7158d8c443edefaeb5bd0f
 title: File Metadata Microservice
 challengeType: 4
 isHidden: false
-isRequired: true
 forumTopicId: 301506
 localeTitle: 文件元数据
 ---
diff --git a/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/request-header-parser-microservice.chinese.md b/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/request-header-parser-microservice.chinese.md
index 4efe911955..dfaa6f8096 100644
--- a/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/request-header-parser-microservice.chinese.md
+++ b/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/request-header-parser-microservice.chinese.md
@@ -3,7 +3,6 @@ id: bd7158d8c443edefaeb5bdff
 title: Request Header Parser Microservice
 challengeType: 4
 isHidden: false
-isRequired: true
 forumTopicId: 301507
 localeTitle: 请求头解析器
 ---
diff --git a/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/timestamp-microservice.chinese.md b/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/timestamp-microservice.chinese.md
index 95008619c0..78b210ae4e 100644
--- a/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/timestamp-microservice.chinese.md
+++ b/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/timestamp-microservice.chinese.md
@@ -3,7 +3,6 @@ id: bd7158d8c443edefaeb5bdef
 title: Timestamp Microservice
 challengeType: 4
 isHidden: false
-isRequired: true
 forumTopicId: 301508
 localeTitle: 时间戳
 ---
diff --git a/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/url-shortener-microservice.chinese.md b/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/url-shortener-microservice.chinese.md
index c2a5a1f350..85c048c110 100644
--- a/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/url-shortener-microservice.chinese.md
+++ b/curriculum/challenges/chinese/05-apis-and-microservices/apis-and-microservices-projects/url-shortener-microservice.chinese.md
@@ -3,7 +3,6 @@ id: bd7158d8c443edefaeb5bd0e
 title: URL Shortener Microservice
 challengeType: 4
 isHidden: false
-isRequired: true
 forumTopicId: 301509
 localeTitle: 短网址
 ---
diff --git a/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/american-british-translator.chinese.md b/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/american-british-translator.chinese.md
index eadbc4d7fb..2e6c95d1e7 100644
--- a/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/american-british-translator.chinese.md
+++ b/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/american-british-translator.chinese.md
@@ -3,7 +3,6 @@ id: 5e601c0d5ac9d0ecd8b94afe
 title: American British Translator
 challengeType: 4
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/issue-tracker.chinese.md b/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/issue-tracker.chinese.md
index 0a69902f4b..2b3470efe0 100644
--- a/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/issue-tracker.chinese.md
+++ b/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/issue-tracker.chinese.md
@@ -2,7 +2,6 @@
 id: 587d8249367417b2b2512c42
 title: Issue Tracker
 challengeType: 4
-isRequired: true
 videoUrl: ''
 localeTitle: 问题跟踪器
 ---
diff --git a/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/metric-imperial-converter.chinese.md b/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/metric-imperial-converter.chinese.md
index 622851ec84..c484407918 100644
--- a/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/metric-imperial-converter.chinese.md
+++ b/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/metric-imperial-converter.chinese.md
@@ -2,7 +2,6 @@
 id: 587d8249367417b2b2512c41
 title: Metric-Imperial Converter
 challengeType: 4
-isRequired: true
 videoUrl: ''
 localeTitle: 公制 - 英制转换器
 ---
diff --git a/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/personal-library.chinese.md b/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/personal-library.chinese.md
index 10cb151bf5..5cea649c3e 100644
--- a/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/personal-library.chinese.md
+++ b/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/personal-library.chinese.md
@@ -2,7 +2,6 @@
 id: 587d824a367417b2b2512c43
 title: Personal Library
 challengeType: 4
-isRequired: true
 videoUrl: ''
 localeTitle: 个人图书馆
 ---
diff --git a/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/sudoku-solver.chinese.md b/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/sudoku-solver.chinese.md
index 5db9e45ce4..d81bd5bb33 100644
--- a/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/sudoku-solver.chinese.md
+++ b/curriculum/challenges/chinese/06-quality-assurance/quality-assurance-projects/sudoku-solver.chinese.md
@@ -3,7 +3,6 @@ id: 5e601bf95ac9d0ecd8b94afd
 title: Sudoku Solver
 challengeType: 4
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/build-your-own-functions.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/build-your-own-functions.chinese.md
index f3911a4a2c..9f63947393 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/build-your-own-functions.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/build-your-own-functions.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f060b6c005b0e76f05b
 title: Build your own Functions
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: nLDychdBwUg
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/comparing-and-sorting-tuples.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/comparing-and-sorting-tuples.chinese.md
index 3b00668b57..005a71955e 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/comparing-and-sorting-tuples.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/comparing-and-sorting-tuples.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0b0b6c005b0e76f06d
 title: Comparing and Sorting Tuples
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: dZXzBXUxxCs
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/conditional-execution.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/conditional-execution.chinese.md
index 53caf6abd9..4bb497000c 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/conditional-execution.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/conditional-execution.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f050b6c005b0e76f058
 title: Conditional Execution
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: gz_IfIsZQtc
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/data-visualization-mailing-lists.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/data-visualization-mailing-lists.chinese.md
index 6eb7780444..91d785f4f7 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/data-visualization-mailing-lists.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/data-visualization-mailing-lists.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f6a0b6c005b0e76f097
 title: 'Data Visualization: Mailing Lists'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: RYdW660KkaQ
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/data-visualization-page-rank.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/data-visualization-page-rank.chinese.md
index c32adbd021..23c50c7579 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/data-visualization-page-rank.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/data-visualization-page-rank.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f6a0b6c005b0e76f096
 title: 'Data Visualization: Page Rank'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: 6-w_qIUwaxU
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/dictionaries-and-loops.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/dictionaries-and-loops.chinese.md
index 82ccfb41db..2879025392 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/dictionaries-and-loops.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/dictionaries-and-loops.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0a0b6c005b0e76f069
 title: Dictionaries and Loops
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: EEmekKiKG70
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/dictionaries-common-applications.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/dictionaries-common-applications.chinese.md
index 4f107cfd97..2b8d949bf9 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/dictionaries-common-applications.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/dictionaries-common-applications.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f090b6c005b0e76f068
 title: "Dictionaries: Common Applications"
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: f17xPfIXct0
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/files-as-a-sequence.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/files-as-a-sequence.chinese.md
index 18443807cd..8d3f51376f 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/files-as-a-sequence.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/files-as-a-sequence.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f080b6c005b0e76f063
 title: Files as a Sequence
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: cIA0EokbaHE
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/intermediate-expressions.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/intermediate-expressions.chinese.md
index ae36985c53..f800942e81 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/intermediate-expressions.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/intermediate-expressions.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f050b6c005b0e76f057
 title: Intermediate Expressions
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: dKgUaIa5ATg
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/intermediate-strings.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/intermediate-strings.chinese.md
index 6044df80bf..1ff811ac22 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/intermediate-strings.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/intermediate-strings.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f070b6c005b0e76f061
 title: Intermediate Strings
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: KgT_fYLXnyk
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-elements-of-python.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-elements-of-python.chinese.md
index 9c025d6bdd..4632e3f60d 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-elements-of-python.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-elements-of-python.chinese.md
@@ -3,7 +3,6 @@ id: 5e6a54c358d3af90110a60a3
 title: 'Introduction: Elements of Python'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: aRY_xjL35v0
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-hardware-achitecture.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-hardware-achitecture.chinese.md
index 4358816c2c..a265c6c4be 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-hardware-achitecture.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-hardware-achitecture.chinese.md
@@ -3,7 +3,6 @@ id: 5e6a54af58d3af90110a60a1
 title: 'Introduction: Hardware Architecture'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: H6qtjRTfSog
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-python-as-a-language.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-python-as-a-language.chinese.md
index 54ed8a07fb..f070deea60 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-python-as-a-language.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-python-as-a-language.chinese.md
@@ -3,7 +3,6 @@ id: 5e6a54ba58d3af90110a60a2
 title: 'Introduction: Python as a Language'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: 0QeGbZNS_bY
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-why-program.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-why-program.chinese.md
index 20c39cb1c3..5b5494ade6 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-why-program.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/introduction-why-program.chinese.md
@@ -3,7 +3,6 @@ id: 5e6a54a558d3af90110a60a0
 title: 'Introduction: Why Program?'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: 3muQV-Im3Z0
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/iterations-definite-loops.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/iterations-definite-loops.chinese.md
index d59229e747..f0d47d78e0 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/iterations-definite-loops.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/iterations-definite-loops.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f070b6c005b0e76f05d
 title: 'Iterations: Definite Loops'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: hiRTRAqNlpE
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/iterations-loop-idioms.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/iterations-loop-idioms.chinese.md
index b20c658f81..771c419728 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/iterations-loop-idioms.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/iterations-loop-idioms.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f070b6c005b0e76f05e
 title: 'Iterations: Loop Idioms'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: AelGAcoMXbI
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/iterations-more-patterns.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/iterations-more-patterns.chinese.md
index d2d67e000d..d1b125eab9 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/iterations-more-patterns.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/iterations-more-patterns.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f070b6c005b0e76f05f
 title: 'Iterations: More Patterns'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: 9Wtqo6vha1M
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/loops-and-iterations.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/loops-and-iterations.chinese.md
index c6a78834cd..3b4447e98c 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/loops-and-iterations.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/loops-and-iterations.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f060b6c005b0e76f05c
 title: Loops and Iterations
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: dLA-szNRnUY
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/make-a-relational-database.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/make-a-relational-database.chinese.md
index 3193d4f39b..300bf237e9 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/make-a-relational-database.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/make-a-relational-database.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f170b6c005b0e76f08b
 title: Make a Relational Database
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: MQ5z4bdF92U
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/more-conditional-structures.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/more-conditional-structures.chinese.md
index 98984bb015..1fd8f6797d 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/more-conditional-structures.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/more-conditional-structures.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f060b6c005b0e76f059
 title: More Conditional Structures
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: HdL82tAZR20
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-protocol.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-protocol.chinese.md
index bbd5c09be6..4f9ae3a74b 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-protocol.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-protocol.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0c0b6c005b0e76f072
 title: Networking Protocol
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: c6vZGescaSc
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-text-processing.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-text-processing.chinese.md
index fd9f4ab137..1fb4ec6868 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-text-processing.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-text-processing.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0c0b6c005b0e76f074
 title: 'Networking: Text Processing'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: Pv_pJgVu8WI
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-using-urllib-in-python.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-using-urllib-in-python.chinese.md
index 0417fbd066..e6012a0bb4 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-using-urllib-in-python.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-using-urllib-in-python.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0d0b6c005b0e76f075
 title: 'Networking: Using urllib in Python'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: 7lFM1T_CxBs
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-web-scraping-with-python.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-web-scraping-with-python.chinese.md
index 82c2ec9ec1..6614e0e0f3 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-web-scraping-with-python.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-web-scraping-with-python.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0d0b6c005b0e76f076
 title: 'Networking: Web Scraping with Python'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: Uyioq2q4cEg
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-with-python.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-with-python.chinese.md
index 9185933c77..9b7e3ffb80 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-with-python.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-with-python.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0c0b6c005b0e76f071
 title: Networking with Python
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: _kJvneKVdNM
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-write-a-web-browser.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-write-a-web-browser.chinese.md
index 23e8299945..12734d09f7 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-write-a-web-browser.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/networking-write-a-web-browser.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0c0b6c005b0e76f073
 title: 'Networking: Write a Web Browser'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: zjyT9DaAjx4
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/object-lifecycle.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/object-lifecycle.chinese.md
index 516c54c9e5..6b7cb4f958 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/object-lifecycle.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/object-lifecycle.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f170b6c005b0e76f087
 title: Object Lifecycle
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: p1r3h_AMMIM
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/objects-a-sample-class.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/objects-a-sample-class.chinese.md
index a1fbc087a0..405fe03ca4 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/objects-a-sample-class.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/objects-a-sample-class.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f160b6c005b0e76f086
 title: 'Objects: A Sample Class'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: FiABKEuaSJ8
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/objects-inheritance.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/objects-inheritance.chinese.md
index 729e0a0633..f27d1b2f98 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/objects-inheritance.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/objects-inheritance.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f170b6c005b0e76f088
 title: 'Objects: Inheritance'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: FBL3alYrxRM
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-dictionaries.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-dictionaries.chinese.md
index 2c480c2633..bfb8fbd800 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-dictionaries.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-dictionaries.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f090b6c005b0e76f067
 title: Python Dictionaries
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: dnzvfimrRMg
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-functions.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-functions.chinese.md
index 7c0b178220..c1e497fc6c 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-functions.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-functions.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f060b6c005b0e76f05a
 title: Python Functions
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: 3JGF-n3tDPU
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-lists.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-lists.chinese.md
index 0129f11cf9..eb120e3eb1 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-lists.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-lists.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f080b6c005b0e76f064
 title: Python Lists
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: Y0cvfDpYC_c
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-objects.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-objects.chinese.md
index 85e8734dfb..1f2e0278a3 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-objects.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/python-objects.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f160b6c005b0e76f085
 title: Python Objects
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: uJxGeTYy0us
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/reading-files.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/reading-files.chinese.md
index 98bcf6f765..efbee638e3 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/reading-files.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/reading-files.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f080b6c005b0e76f062
 title: Reading Files
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: Fo1tW09KIwo
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/regular-expressions-matching-and-extracting-data.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/regular-expressions-matching-and-extracting-data.chinese.md
index 8daea11cea..ca9914712a 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/regular-expressions-matching-and-extracting-data.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/regular-expressions-matching-and-extracting-data.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0b0b6c005b0e76f06f
 title: 'Regular Expressions: Matching and Extracting Data'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: LaCZnTbQGkE
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/regular-expressions-practical-applications.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/regular-expressions-practical-applications.chinese.md
index 2cc246b8cc..bbef8e2f05 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/regular-expressions-practical-applications.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/regular-expressions-practical-applications.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0b0b6c005b0e76f070
 title: 'Regular Expressions: Practical Applications'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: xCjFU9G6x48
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/regular-expressions.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/regular-expressions.chinese.md
index d800d92117..767635fef6 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/regular-expressions.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/regular-expressions.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0b0b6c005b0e76f06e
 title: Regular Expressions
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: Yud_COr6pZo
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-database-design.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-database-design.chinese.md
index f0dc919762..88315a0380 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-database-design.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-database-design.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f180b6c005b0e76f08c
 title: Relational Database Design
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: AqdfbrpkbHk
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-and-sqlite.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-and-sqlite.chinese.md
index 8f1ec890d8..dae0340e1a 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-and-sqlite.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-and-sqlite.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f170b6c005b0e76f08a
 title: 'Relational Databases and SQLite'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: QlNod5-kFpA
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-join-operation.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-join-operation.chinese.md
index 0305cdb9f2..f805a15bb0 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-join-operation.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-join-operation.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f180b6c005b0e76f08f
 title: 'Relational Databases: Join Operation'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: jvDw3D9GKac
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-many-to-many-relationships.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-many-to-many-relationships.chinese.md
index c66bb2b02d..4ee991deb5 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-many-to-many-relationships.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-many-to-many-relationships.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f190b6c005b0e76f090
 title: 'Relational Databases: Many-to-many Relationships'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: z-SBYcvEQOc
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-relationship-building.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-relationship-building.chinese.md
index 519abf5302..ef05adaec2 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-relationship-building.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-relationship-building.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f180b6c005b0e76f08e
 title: 'Relational Databases: Relationship Building'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: CSbqczsHVnc
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/representing-relationships-in-a-relational-database.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/representing-relationships-in-a-relational-database.chinese.md
index ff0775a7e7..a256a623a9 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/representing-relationships-in-a-relational-database.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/representing-relationships-in-a-relational-database.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f180b6c005b0e76f08d
 title: Representing Relationships in a Relational Database
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: -orenCNdC2Q
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/strings-and-lists.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/strings-and-lists.chinese.md
index db6f5edef1..64dcfc937e 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/strings-and-lists.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/strings-and-lists.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f090b6c005b0e76f066
 title: Strings and Lists
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: lxcFa7ldCi0
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/strings-in-python.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/strings-in-python.chinese.md
index 824e820f3a..683e01b46c 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/strings-in-python.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/strings-in-python.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f070b6c005b0e76f060
 title: Strings in Python
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: LYZj207fKpQ
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/the-tuples-collection.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/the-tuples-collection.chinese.md
index 2e1d9fb6bf..bbcdadd53a 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/the-tuples-collection.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/the-tuples-collection.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0a0b6c005b0e76f06c
 title: The Tuples Collection
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: 3Lxpladfh2k
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/using-web-services.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/using-web-services.chinese.md
index d48d5a80e7..6fc920ac68 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/using-web-services.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/using-web-services.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0e0b6c005b0e76f07a
 title: Using Web Services
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: oNl1OVDPGKE
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/variables-expressions-and-statements.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/variables-expressions-and-statements.chinese.md
index c998e0c87d..e4b7435567 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/variables-expressions-and-statements.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/variables-expressions-and-statements.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f050b6c005b0e76f056
 title: Variables, Expressions, and Statements
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: nELR-uyyrok
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/visualizing-data-with-python.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/visualizing-data-with-python.chinese.md
index 16e00b5be8..679ac649fd 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/visualizing-data-with-python.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/visualizing-data-with-python.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f690b6c005b0e76f095
 title: Visualizing Data with Python
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: e3lydkH0prw
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-api-rate-limiting-and-security.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-api-rate-limiting-and-security.chinese.md
index 139a8ee51c..d00d42188c 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-api-rate-limiting-and-security.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-api-rate-limiting-and-security.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f150b6c005b0e76f080
 title: 'Web Services: API Rate Limiting and Security'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: pI-g0lI8ngs
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-apis.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-apis.chinese.md
index 7d57baafeb..2731c72daf 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-apis.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-apis.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f150b6c005b0e76f07f
 title: 'Web Services: APIs'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: oUNn1psfBJg
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-json.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-json.chinese.md
index a67d91610c..83148990a0 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-json.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-json.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f140b6c005b0e76f07d
 title: 'Web Services: JSON'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: ZJE-U56BppM
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-service-oriented-approach.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-service-oriented-approach.chinese.md
index 34bbd557fa..56768bb4e6 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-service-oriented-approach.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-service-oriented-approach.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f140b6c005b0e76f07e
 title: 'Web Services: Service Oriented Approach'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: muerlsCHExI
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-xml-schema.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-xml-schema.chinese.md
index 35d6a281b7..0a17771ab1 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-xml-schema.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-xml-schema.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0e0b6c005b0e76f07c
 title: 'Web Services: XML Schema'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: yWU9kTxW-nc
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-xml.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-xml.chinese.md
index b66f8414a1..5f0ddc2ce8 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-xml.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/web-services-xml.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f0e0b6c005b0e76f07b
 title: 'Web Services: XML'
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: _pZ0srbg7So
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/working-with-lists.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/working-with-lists.chinese.md
index 7311366d36..6acb40bd9b 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/working-with-lists.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/working-with-lists.chinese.md
@@ -3,7 +3,6 @@ id: 5e7b9f090b6c005b0e76f065
 title: Working with Lists
 challengeType: 11
 isHidden: false
-isRequired: true
 videoId: lCnHfTHkhbE
 ---
 
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/arithmetic-formatter.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/arithmetic-formatter.chinese.md
index 1fe0fe73bd..30c7b46cd4 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/arithmetic-formatter.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/arithmetic-formatter.chinese.md
@@ -3,7 +3,6 @@ id: 5e44412c903586ffb414c94c
 title: Arithmetic Formatter
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/budget-app.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/budget-app.chinese.md
index 8b603e06cd..546322e92d 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/budget-app.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/budget-app.chinese.md
@@ -3,7 +3,6 @@ id: 5e44413e903586ffb414c94e
 title: Budget App
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/polygon-area-calculator.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/polygon-area-calculator.chinese.md
index 17d88f22bc..eb46864aa0 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/polygon-area-calculator.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/polygon-area-calculator.chinese.md
@@ -3,7 +3,6 @@ id: 5e444147903586ffb414c94f
 title: Polygon Area Calculator
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/probability-calculator.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/probability-calculator.chinese.md
index ac2cd5f5b4..e8d88e602d 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/probability-calculator.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/probability-calculator.chinese.md
@@ -3,7 +3,6 @@ id: 5e44414f903586ffb414c950
 title: Probability Calculator
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/time-calculator.chinese.md b/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/time-calculator.chinese.md
index 598a74bdc3..78ee22ad0c 100644
--- a/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/time-calculator.chinese.md
+++ b/curriculum/challenges/chinese/07-scientific-computing-with-python/scientific-computing-with-python-projects/time-calculator.chinese.md
@@ -3,7 +3,6 @@ id: 5e444136903586ffb414c94d
 title: Time Calculator
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/demographic-data-analyzer.chinese.md b/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/demographic-data-analyzer.chinese.md
index 3ef8563e93..8bfb27c362 100644
--- a/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/demographic-data-analyzer.chinese.md
+++ b/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/demographic-data-analyzer.chinese.md
@@ -3,7 +3,6 @@ id: 5e46f7e5ac417301a38fb929
 title: Demographic Data Analyzer
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/mean-variance-standard-deviation-calculator.chinese.md b/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/mean-variance-standard-deviation-calculator.chinese.md
index 70106b1cfa..89abca63c5 100644
--- a/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/mean-variance-standard-deviation-calculator.chinese.md
+++ b/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/mean-variance-standard-deviation-calculator.chinese.md
@@ -3,7 +3,6 @@ id: 5e46f7e5ac417301a38fb928
 title: Mean-Variance-Standard Deviation Calculator
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/medical-data-visualizer.chinese.md b/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/medical-data-visualizer.chinese.md
index 07ceed67b4..96663b9d05 100644
--- a/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/medical-data-visualizer.chinese.md
+++ b/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/medical-data-visualizer.chinese.md
@@ -3,7 +3,6 @@ id: 5e46f7f8ac417301a38fb92a
 title: Medical Data Visualizer
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/page-view-time-series-visualizer.chinese.md b/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/page-view-time-series-visualizer.chinese.md
index 8a1b64d0d2..04d53d4211 100644
--- a/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/page-view-time-series-visualizer.chinese.md
+++ b/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/page-view-time-series-visualizer.chinese.md
@@ -3,7 +3,6 @@ id: 5e46f802ac417301a38fb92b
 title: Page View Time Series Visualizer
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/sea-level-predictor.chinese.md b/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/sea-level-predictor.chinese.md
index 9dfa51db66..f6b407638c 100644
--- a/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/sea-level-predictor.chinese.md
+++ b/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-projects/sea-level-predictor.chinese.md
@@ -3,7 +3,6 @@ id: 5e4f5c4b570f7e3a4949899f
 title: Sea Level Predictor
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/09-information-security/information-security-projects/anonymous-message-board.chinese.md b/curriculum/challenges/chinese/09-information-security/information-security-projects/anonymous-message-board.chinese.md
index 9b141b6992..a4f0b5fae0 100644
--- a/curriculum/challenges/chinese/09-information-security/information-security-projects/anonymous-message-board.chinese.md
+++ b/curriculum/challenges/chinese/09-information-security/information-security-projects/anonymous-message-board.chinese.md
@@ -2,7 +2,6 @@
 id: 587d824a367417b2b2512c45
 title: Anonymous Message Board
 challengeType: 4
-isRequired: true
 videoUrl: ''
 localeTitle: 匿名留言板
 ---
diff --git a/curriculum/challenges/chinese/09-information-security/information-security-projects/port-scanner.chinese.md b/curriculum/challenges/chinese/09-information-security/information-security-projects/port-scanner.chinese.md
index fcfc11549b..bdf16d206a 100644
--- a/curriculum/challenges/chinese/09-information-security/information-security-projects/port-scanner.chinese.md
+++ b/curriculum/challenges/chinese/09-information-security/information-security-projects/port-scanner.chinese.md
@@ -3,7 +3,6 @@ id: 5e46f979ac417301a38fb932
 title: Port Scanner
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/09-information-security/information-security-projects/secure-real-time-multiplayer-game.chinese.md b/curriculum/challenges/chinese/09-information-security/information-security-projects/secure-real-time-multiplayer-game.chinese.md
index e3ac81c6c5..8e2c66e486 100644
--- a/curriculum/challenges/chinese/09-information-security/information-security-projects/secure-real-time-multiplayer-game.chinese.md
+++ b/curriculum/challenges/chinese/09-information-security/information-security-projects/secure-real-time-multiplayer-game.chinese.md
@@ -3,7 +3,6 @@ id: 5e601c775ac9d0ecd8b94aff
 title: Secure Real Time Multiplayer Game
 challengeType: 4
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/09-information-security/information-security-projects/sha-1-password-cracker.chinese.md b/curriculum/challenges/chinese/09-information-security/information-security-projects/sha-1-password-cracker.chinese.md
index 1a279c0ba4..af0b720712 100644
--- a/curriculum/challenges/chinese/09-information-security/information-security-projects/sha-1-password-cracker.chinese.md
+++ b/curriculum/challenges/chinese/09-information-security/information-security-projects/sha-1-password-cracker.chinese.md
@@ -3,7 +3,6 @@ id: 5e46f983ac417301a38fb933
 title: SHA-1 Password Cracker
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/09-information-security/information-security-projects/stock-price-checker.chinese.md b/curriculum/challenges/chinese/09-information-security/information-security-projects/stock-price-checker.chinese.md
index 15872ef8cb..a4276d0f5d 100644
--- a/curriculum/challenges/chinese/09-information-security/information-security-projects/stock-price-checker.chinese.md
+++ b/curriculum/challenges/chinese/09-information-security/information-security-projects/stock-price-checker.chinese.md
@@ -2,7 +2,6 @@
 id: 587d824a367417b2b2512c44
 title: Stock Price Checker
 challengeType: 4
-isRequired: true
 videoUrl: ''
 localeTitle: 股票价格检查
 ---
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-camper-leaderboard.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-camper-leaderboard.chinese.md
index b505fc78ee..1bf96832f2 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-camper-leaderboard.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-camper-leaderboard.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7156d8c242eddfaeb5bd13
 title: Build a Camper Leaderboard
-isRequired: false
 challengeType: 3
 videoUrl: ''
 localeTitle: 建立一个露营者排行榜
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-light-bright-app.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-light-bright-app.chinese.md
index e59b07f9b0..a10bc3496c 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-light-bright-app.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-light-bright-app.chinese.md
@@ -2,7 +2,6 @@
 id: 5a5d02bd919fcf9ca8cf46cb
 title: Build a Light-Bright App
 challengeType: 3
-isRequired: false
 videoUrl: ''
 localeTitle: 构建一个明亮的应用程序
 ---
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-nightlife-coordination-app.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-nightlife-coordination-app.chinese.md
index 787bf151cb..92ee4feb04 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-nightlife-coordination-app.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-nightlife-coordination-app.chinese.md
@@ -2,7 +2,6 @@
 id: bd7158d8c443eddfaeb5bdff
 title: Build a Nightlife Coordination App
 challengeType: 4
-isRequired: true
 videoUrl: ''
 localeTitle: 建立夜生活协调应用程序
 ---
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-pong-game.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-pong-game.chinese.md
index ae15dcfdc6..c6540f12eb 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-pong-game.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-pong-game.chinese.md
@@ -2,7 +2,6 @@
 id: 5a4b7fcdb66f799f199e11db
 title: Build a Pong Game
 challengeType: 3
-isRequired: false
 videoUrl: ''
 localeTitle: 建立乒乓球比赛
 ---
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-recipe-box.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-recipe-box.chinese.md
index 63c1f9bd22..ae0cbd660f 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-recipe-box.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-recipe-box.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7155d8c242eddfaeb5bd13
 title: Build a Recipe Box
-isRequired: false
 challengeType: 3
 videoUrl: ''
 localeTitle: 建立配方盒
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-roguelike-dungeon-crawler-game.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-roguelike-dungeon-crawler-game.chinese.md
index 5033e2716c..5780563b06 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-roguelike-dungeon-crawler-game.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-roguelike-dungeon-crawler-game.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7153d8c242eddfaeb5bd13
 title: Build a Roguelike Dungeon Crawler Game
-isRequired: false
 challengeType: 3
 videoUrl: ''
 localeTitle: 建立一个Roguelike Dungeon Crawler游戏
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-simon-game.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-simon-game.chinese.md
index d653f82251..15bc852e28 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-simon-game.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-simon-game.chinese.md
@@ -2,7 +2,6 @@
 id: bd7158d8c442eddfaeb5bd1c
 title: Build a Simon Game
 challengeType: 3
-isRequired: false
 videoUrl: ''
 localeTitle: 建立一个西蒙游戏
 ---
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-tic-tac-toe-game.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-tic-tac-toe-game.chinese.md
index e5b26c539c..16bee26b50 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-tic-tac-toe-game.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-tic-tac-toe-game.chinese.md
@@ -2,7 +2,6 @@
 id: bd7158d8c442eedfaeb5bd1c
 title: Build a Tic Tac Toe Game
 challengeType: 3
-isRequired: false
 videoUrl: ''
 localeTitle: 建立一个Tic Tac Toe游戏
 ---
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-voting-app.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-voting-app.chinese.md
index 32dae79d83..00a4865396 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-voting-app.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-voting-app.chinese.md
@@ -2,7 +2,6 @@
 id: bd7158d8c443eddfaeb5bdef
 title: Build a Voting App
 challengeType: 4
-isRequired: true
 videoUrl: ''
 localeTitle: 建立一个投票应用程序
 ---
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-wikipedia-viewer.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-wikipedia-viewer.chinese.md
index b893f1ae78..c68d1255d9 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-wikipedia-viewer.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-a-wikipedia-viewer.chinese.md
@@ -2,7 +2,6 @@
 id: bd7158d8c442eddfaeb5bd19
 title: Build a Wikipedia Viewer
 challengeType: 3
-isRequired: false
 videoUrl: ''
 localeTitle: 构建Wikipedia查看器
 ---
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-an-image-search-abstraction-layer.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-an-image-search-abstraction-layer.chinese.md
index 07cb54ee46..b897166232 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-an-image-search-abstraction-layer.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-an-image-search-abstraction-layer.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7158d8c443edefaeb5bdee
 title: Build an Image Search Abstraction Layer
-isRequired: true
 challengeType: 4
 videoUrl: ''
 localeTitle: 构建图像搜索抽象层
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-the-game-of-life.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-the-game-of-life.chinese.md
index 8ca10fefeb..588852d146 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-the-game-of-life.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/build-the-game-of-life.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7154d8c242eddfaeb5bd13
 title: Build the Game of Life
-isRequired: false
 challengeType: 3
 videoUrl: ''
 localeTitle: 打造生命游戏
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/chart-the-stock-market.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/chart-the-stock-market.chinese.md
index 1c71eced96..69202a4c7b 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/chart-the-stock-market.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/chart-the-stock-market.chinese.md
@@ -2,7 +2,6 @@
 id: bd7158d8c443eddfaeb5bd0e
 title: Chart the Stock Market
 challengeType: 4
-isRequired: true
 videoUrl: ''
 localeTitle: 图表股市
 ---
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/map-data-across-the-globe.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/map-data-across-the-globe.chinese.md
index c6c3583194..8dc1199f10 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/map-data-across-the-globe.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/map-data-across-the-globe.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7108d8c242eddfaeb5bd13
 title: Map Data Across the Globe
-isRequired: false
 challengeType: 3
 videoUrl: ''
 localeTitle: 全球地图数据
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/p2p-video-chat-application.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/p2p-video-chat-application.chinese.md
index 33f71aa4ef..4c3f82d34a 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/p2p-video-chat-application.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/p2p-video-chat-application.chinese.md
@@ -2,7 +2,6 @@
 id: bd7150d8c442eddfafb5bd1c
 title: P2P Video Chat Application
 challengeType: 3
-isRequired: false
 videoUrl: ''
 localeTitle: P2P视频聊天应用
 ---
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/show-national-contiguity-with-a-force-directed-graph.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/show-national-contiguity-with-a-force-directed-graph.chinese.md
index 6e981100f4..2fe162a7b5 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/show-national-contiguity-with-a-force-directed-graph.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/show-national-contiguity-with-a-force-directed-graph.chinese.md
@@ -1,7 +1,6 @@
 ---
 id: bd7198d8c242eddfaeb5bd13
 title: Show National Contiguity with a Force Directed Graph
-isRequired: false
 challengeType: 3
 videoUrl: ''
 localeTitle: 用力导向图显示全国连续性
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/show-the-local-weather.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/show-the-local-weather.chinese.md
index c5fe0482ae..83fe84c85d 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/show-the-local-weather.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/show-the-local-weather.chinese.md
@@ -2,7 +2,6 @@
 id: bd7158d8c442eddfaeb5bd10
 title: Show the Local Weather
 challengeType: 3
-isRequired: false
 videoUrl: ''
 localeTitle: 显示当地天气
 ---
diff --git a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/use-the-twitch-json-api.chinese.md b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/use-the-twitch-json-api.chinese.md
index 98bc5c2539..76ccba16bb 100644
--- a/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/use-the-twitch-json-api.chinese.md
+++ b/curriculum/challenges/chinese/10-coding-interview-prep/take-home-projects/use-the-twitch-json-api.chinese.md
@@ -2,7 +2,6 @@
 id: bd7158d8c442eddfaeb5bd1f
 title: Use the Twitch JSON API
 challengeType: 3
-isRequired: false
 videoUrl: ''
 localeTitle: 使用Twitch JSON API
 ---
diff --git a/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/book-recommendation-engine-using-knn.chinese.md b/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/book-recommendation-engine-using-knn.chinese.md
index 910a14ba11..f7bd633527 100644
--- a/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/book-recommendation-engine-using-knn.chinese.md
+++ b/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/book-recommendation-engine-using-knn.chinese.md
@@ -3,7 +3,6 @@ id: 5e46f8e3ac417301a38fb92f
 title: Book Recommendation Engine using KNN
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/cat-and-dog-image-classifier.chinese.md b/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/cat-and-dog-image-classifier.chinese.md
index 2deaca49db..b2f78ac3ef 100644
--- a/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/cat-and-dog-image-classifier.chinese.md
+++ b/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/cat-and-dog-image-classifier.chinese.md
@@ -3,7 +3,6 @@ id: 5e46f8dcac417301a38fb92e
 title: Cat and Dog Image Classifier
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/linear-regression-health-costs-calculator.chinese.md b/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/linear-regression-health-costs-calculator.chinese.md
index 3f335d4aab..483a3eee6d 100644
--- a/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/linear-regression-health-costs-calculator.chinese.md
+++ b/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/linear-regression-health-costs-calculator.chinese.md
@@ -3,7 +3,6 @@ id: 5e46f8edac417301a38fb930
 title: Linear Regression Health Costs Calculator
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/neural-network-sms-text-classifier.chinese.md b/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/neural-network-sms-text-classifier.chinese.md
index 76d35ff978..8a2c90c230 100644
--- a/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/neural-network-sms-text-classifier.chinese.md
+++ b/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/neural-network-sms-text-classifier.chinese.md
@@ -3,7 +3,6 @@ id: 5e46f8edac417301a38fb931
 title: Neural Network SMS Text Classifier
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description
diff --git a/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/rock-paper-scissors.chinese.md b/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/rock-paper-scissors.chinese.md
index 7132a34815..093e88c9b8 100644
--- a/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/rock-paper-scissors.chinese.md
+++ b/curriculum/challenges/chinese/11-machine-learning-with-python/machine-learning-with-python-projects/rock-paper-scissors.chinese.md
@@ -3,7 +3,6 @@ id: 5e46f8d6ac417301a38fb92d
 title: Rock Paper Scissors
 challengeType: 10
 isHidden: false
-isRequired: true
 ---
 
 ## Description