anchor.diff:    We don't really expect users to paste a route URL into the address bar.
     We add an anchor tag to the template which, when clicked, triggers navigation to the `HeroesComponent`.
   
  -  我们当然不会真让用户往地址栏中粘贴路由的URL，而应该在模板中的什么地方添加一个链接标签。点击时，就会导航到`HeroesComponent`组件。
  +  我们当然不会真让用户往地址栏中粘贴路由的URL，而应该在模板中的什么地方添加一个锚标签。点击时，就会导航到`HeroesComponent`组件。
   
     The revised template looks like this:
   
  
positive.code:   路由的配置可能迅速占领这个模块，并掩盖其主要目的，即为Angular编译器设置整个应用的关键配置。
  
    We should refactor the routing configuration into its own class.
    What kind of class? 
    The current `RouterModule.forRoot()` produces an Angular `ModuleWithProviders` which suggests that a
    class dedicated to routing should be some kind of module.
    It should be a [_Routing Module_](../guide/router.html#routing-module).
  
negative.code:     :marked
        To see the URL changes in the browser address bar,
        pop out the preview window by clicking the blue 'X' button in the upper right corner:
  
        注意看浏览器地址栏中的URL变化，点击右上角的蓝色'X'按钮，弹出预览窗口。
  
  .l-main-section
  