anchor.diff:    Because this bundle file will load first, `polyfills.ts` is also a good place to configure the browser environment 
     for production or development.
   
  -  由于这个包最先被加载，所以`polyfills.ts`非常适合用来配置浏览器环境，如生产环境配置或是开发环境。
  +  由于这个包最先加载，所以`polyfills.ts`非常适合用来配置浏览器环境，如生产环境配置或是开发环境。
   
   a(id="common-configuration")
   .l-main-section
  
positive.code:   
    * polyfills - the polyfills needed to run Angular applications in most modern browsers.
  
      polyfills - 使得Angular应用能够运行在大多数的现代浏览器；
  
    * vendor - the third-party dependencies such as Angular, lodash, and bootstrap.css.
  
      vendor - 第三方依赖，如Angular、lodash和bootstrap.css；
  
    * app - the application code.
  
  
negative.code:   The app will `import` dozens if not hundreds of JavaScript and TypeScript files. 
    You could write `import` statements with explicit extensions like this example:
  
    如果你的应用程序只须`import`几十个JavaScript或TypeScript文件，而不是几百个，你可以在`import`语句里完整写上扩展名，如：
  
  +makeExample('webpack/ts-snippets/webpack.config.snippets.ts', 'single-import')(format=".")
  
  