anchor.diff:      [학습 경로](../guide/learning-angular.html#architecture)로 돌아와서
       이번 튜토리얼에서 발견한 개념과 사례에 대해서 읽을 수 있습니다.
   
  -    Return to the [learning path](../guide/learning-angular.html#architecture) where
  +    Return to the [learning path](../guide/learning-angular.html#architecture) where 
       you can read about the concepts and practices you discovered in this tutorial.
  
positive.code:   여전히 !{_Promise}를 반환합니다.
    `getHeroes()`를 호출하는 어떤 컴포넌트도 수정하지 않아도 됩니다.
  
    Although we made significant *internal* changes to `getHeroes()` and `getHero()`,
    the public signatures did not change.
    We still return a !{_Promise} from both methods. 
    We won't have to update any of the components that call them.
  
negative.code:     연산자(operator)와 익스텐션(extension)을 통해 지원을 확대할 수 있습니다.
      어떻게 하는지 곧 살펴보겠습니다.
  
      Angular core has basic support for observables. 
      We developers augment that support with operators and extensions from the
      <a href="http://reactivex.io/rxjs" target="_blank" title="RxJS">RxJS library</a>.
      We'll see how shortly.
  