anchor.diff:      当我们需要一个模块中的某些东西时，我们引入（import）它。
       在这里，我们从Angular的主模块中引入了`Component`装饰器，我们需要它来定义我们的组件。
   
  -  +makeExample('quickstart/ts/app/app.component.ts', 'import', 'app/app.component.ts (import)')(format=".")
  +  +makeExample('quickstart/ts/app/app.component.ts', 'import', 'app/app.component.ts (导入)')(format=".")
   
     a(id="component-decorator")
     :marked
  
positive.code: .l-main-section
  :marked
    ## Wrap Up
    Our first application doesn't do much. It's basically "Hello, World" for Angular 2.
  
    We kept it simple in our first pass: we wrote a little Angular component,
    we added some JavaScript libraries to `index.html`, and launched with a
    static file server. That's about all we'd expect to do for a "Hello, World" app.
  
    **We have greater ambitions.**
  
    The good news is that the overhead of setup is (mostly) behind us. 
    We'll probably only touch the `package.json` to update libraries.
    We'll likely open `index.html` only if we need to add a library or some css stylesheets.
  
    We're about to take the next step and build a small application that 
    demonstrates the great things we can build with Angular 2.
  
    Join us on the [Tour of Heroes Tutorial](./tutorial)!
  
negative.code:     Most applications need those capabilities and most applications
      should run in Internet Explorer.
  
      一开始，我们先进行IE的polyfill（译注：指填充，用js来弥补浏览器原本不具备的能力）。
      IE需要填充才能正确运行依赖ES2015 promise（译注：ES2015的新特性，用于支持异步代码）和动态模块加载特性的应用程序。
      大多数应用还是得运行在IE中，所以我们需要这些能力。
  
      Next are the polyfills for Angular2, `angular2-polyfills.js`.
      
      下一个是Angular2的polyfill —— `angular2-polyfills.js`。
      
      Then the [SystemJS](#systemjs) library for module loading,
      followed by the Reactive Extensions RxJS library.
      
      下一个是响应式编程的扩展库RxJS。
      
      最后则是为实现模块加载功能而引入的[SystemJS](#systemjs)库。
  
    .l-sub-section
      :marked
        Our QuickStart doesn't use the Reactive Extensions 
        but any substantial application will want them
        when working with observables.
        We added the library here in QuickStart so we don't forget later.
        
        我们的QuickStart不会用到响应式扩展，但是大量的应用需要它们来提供observable（译注：响应式编程的核心特性，指监听数据的变更以便做出响应）特性。
        我们把它加到QuickStart中，以免将来忘了。
  
    :marked
      Finally, we loaded the web development version of Angular 2 itself.
      
      最后，我们加载Angular2的“Web开发版”。
  
      We'll make different choices as we gain experience and
      become more concerned about production qualities such as
      load times and memory footprint.
      
      一旦我们更有经验、对产品质量更加关注（如加载时间、内存脚印等），我们也可以做出不同的选择
  
    a(id="systemjs")
    :marked
      ### SystemJS Configuration
      ### SystemJS配置
  
      The QuickStart uses <a href="https://github.com/systemjs/systemjs" target="_blank">SystemJS</a>
        to load application and library modules. 
  