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  -      <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>
  +      <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.
     
  
positive.code:   :marked
      Angular apps are modular and Angular has its own modularity system called _Angular modules_ or _NgModules_.
  
    Angular 应用是模块化的，并且 Angular 有自己的模块系统，它被称为 _Angular 模块_或 _NgModules_。_Angular modules_ are a big deal. 
    This page introduces modules; the [Angular modules](ngmodule.html) page covers them in depth.
  
  _Angular 模块_很重要。
    这里只是简单介绍，在 [Angular 模块](ngmodule.html)中会做深入讲解。<br class="l-clear-both"><br>
  :marked
    Every Angular app has at least one Angular module class, [the _root module_](appmodule.html "AppModule: the root module"), 
    conventionally named `AppModule`.
  
    每个 Angular 应用至少有一个模块（[_根模块_](appmodule.html "AppModule: 根模块")），习惯上命名为`AppModule`。While the _root module_ may be the only module in a small application, most apps have many more 
    _feature modules_, each a cohesive block of code dedicated to an application domain,
    a workflow, or a closely related set of capabilities. 
  
    _根模块_在一些小型应用中可能是唯一的模块，大多数应用会有很多_特性模块_，每个模块都是一个内聚的代码块专注于某个应用领域、工作流或紧密相关的功能。An Angular module, whether a _root_ or _feature_, is a class with an `@NgModule` decorator.
  Angular 模块（无论是_根模块_还是_特性模块_）都是一个带有`@NgModule`装饰器的类。.l-sub-section
    :marked
      Decorators are functions that modify JavaScript classes.
      Angular has many decorators that attach metadata to classes so that it knows
  
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。
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    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='.')
  