anchor.diff:    :marked
       ### Angular modules vs. JavaScript modules
   
  -    ### Angular 模块 vs. JavaScript 模块The Angular module &mdash; a class decorated with `@NgModule` &mdash; is a fundamental feature of Angular.
  -  
  -    Angular 模块（一个用`@NgModule`装饰的类）是 Angular 的基础特性。JavaScript also has its own module system for managing collections of JavaScript objects.
  -    It's completely different and unrelated to the Angular module system.JavaScript 也有自己的模块系统，用来管理一组 JavaScript 对象。
  +    ### Angular 模块 vs. JavaScript 模块
  +    
  +    The Angular module &mdash; a class decorated with `@NgModule` &mdash; is a fundamental feature of Angular.
  +  
  +    Angular 模块（一个用`@NgModule`装饰的类）是 Angular 的基础特性。
  +    
  +    JavaScript also has its own module system for managing collections of JavaScript objects.
  +    It's completely different and unrelated to the Angular module system.
  +    
  +    JavaScript 也有自己的模块系统，用来管理一组 JavaScript 对象。
       它与 Angular 的模块系统完全不同且完全无关。
       
       In JavaScript each _file_ is a module and all objects defined in the file belong to that module.
  
positive.code:   
    .l-sub-section
      :marked
        <a href="http://exploringjs.com/es6/ch_modules.html" target="_blank">Learn more about the JavaScript module system on the web.</a><a href="http://exploringjs.com/es6/ch_modules.html" target="_blank">学习更多关于 JavaScript 模块的知识。</a>
    :marked
      These are two different and _complementary_ module systems. Use them both to write your apps.
    
  
negative.code:     根模块不需要_导出_任何东西，因为其它组件不需要导入根模块。
  :marked
    Launch an application by _bootstrapping_ its root module. 
    During development you're likely to bootstrap the `AppModule` in a `main.ts` file like this one.
    
    我们通过_引导_根模块来启动应用。
    在开发期间，你通常在一个`main.ts`文件中引导`AppModule`，就像这样：
      
  +makeExample('src/main.ts', '', 'src/main.ts')(format='.')
  