anchor.diff:    But "almost" isn't good enough for routed applications.
     
     `AppComponent`的注入器是根注入器的*子级*，注入器层次中的下一级。
  -  这对于不用路由器的应用来说*几乎是*整个应用了。
  +  这对于没有路由器的应用来说*几乎是*整个应用了。
     但这个“几乎”对于带路有的应用仍然是不够的。
   
     `AppComponent` services don't exist at the root level where routing operates. 
  
positive.code: :marked
    #### What kinds of modules should I have and how should I use them?
    
    #### 有哪些类型的模块？我该如何使用它们？
  
    Every app is different and developers have varying levels of experience and comfort with the available choices.
    Some suggestions and guidelines appear to have wide appeal.
  
negative.code: :marked
    ### Should I add app-wide providers to the root _AppModule_ or the root _AppComponent_?
    
    ### 我应该把全应用级提供商添加到根模块`AppModule`中还是根组件`AppComponent`中？
  
  .alert.is-helpful
    :marked
  