确定哪些分析类具有与其它类之间的关系。

Identify which of these analysis classes have some kind of relationship with each other.

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换句话说，它是一个直接响应来自其它类的消息的操作。

In other words, it is an operation that directly responds to a message from other classes.

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这与我们软件设计中的分类有点相似，它在其它类中调用方法。

This is somewhat analogous to classes in our software designs that call methods in other classes.

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