类图捕捉必须行为；实例图捕捉可能行为。

Class diagrams capture must behavior; instance diagrams capture may behavior.

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让我们查阅资源管理器的实例图(图4)(已实现的类以深灰色显示)。

Let's review the instance diagram (Figure 4) for Explorer (I've shown the classes that we implemented in a darker gray).

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实例序列图描述了两个实例之间可能发生的单一消息交换。

An instance sequence diagram describes a single possible exchange of messages between two instances.

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