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docs: 修改一个翻译错误

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Echo Chan 2018-12-25 15:01:37 +08:00 committed by 雪狼
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aio/content/tutorial/toh-pt4.md
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@ -152,7 +152,7 @@ When you provide the service at the root level, Angular creates a single, shared
Registering the provider in the `@Injectable` metadata also allows Angular to optimize an app by removing the service if it turns out not to be used after all.
当你在顶层提供该服务时，Angular 就会为 `HeroService` 创建一个单一的、共享的实例，并把它注入到任何想要它的类上。
在 `@Injectable` 元数据中注册该提供商，还能让 Angular 可以通过移除那些完全没有用过的服务，来进行优化。
在 `@Injectable` 元数据中注册该提供商，还能允许 Angular 通过移除那些完全没有用过的服务来进行优化。
<div class="alert is-helpful">