This is the heart of the use case description, but not its sum total.

这是用例描述的核心部分，但不是全部。

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Use case description Details of the use case flow, including brief description, steps, alternate flows.

用例描述用例流程的细节信息，包括简单介绍，步骤，选择的流程。

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A use case model consisting of the use case diagram, actor definitions, and a use case description may also be produced. 6.

一个用例模型由这个用例的图，参与者定义构成，也可能包括这个用例的描述。

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