We should ask ourselves - and the users of our directives - to think carefully about the consequences of adding and removing elements and of creating and destroying components.

我们应该提醒自己以及我们指令的使用者，来仔细考虑添加元素、移除元素以及创建和销毁组件的后果。

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We can extend the HTML vocabulary of our templates with components and directives that appear as new elements and attributes.

可以通过组件和指令来扩展模板中的HTML词汇。它们看上去就是新元素和属性。

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