通过相互分离接口保持关注点的分离。
Keep separation of concerns by separating the interfaces from each other.
MVC模式天生就是可测试的，而且鼓励对关注点的分离。
By nature, the MVC pattern is highly testable and encourages good separation of concerns.
可以利用这种关注点的分离分别测试横切规范及它们的行为。
You can leverage this separation of concerns to test their behavior separately from the crosscutting specification.
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