The simplicity of the Use Case diagram engenders both weaknesses and strengths.

简单的用例图包含弱点和优点.

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The Use Case diagram, and the entire use case approach, provides that measuring stick.

用例图和所有的用例方法提供了衡量的途径.

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The Use Case diagram provides the means to model the system in precisely this manner.

用例图提供手段按照这种精确方式模拟系统.

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