内部交互可能由参与者启动(如果子系统用例是交互的基础)，但它更可能是由叫作Sender的普通类启动的。

An internal interaction might be initiated by an actor (if subsystem use cases are the basis for the interaction), but more likely it would be started by a generic class called Sender.

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定义内部和外部参与者。

Define internal and external stakeholders.

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第5步定义内部和外部参与者。

Step 5. Define internal and external stakeholders.

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