This diagram has already been shown in Figure 13, and represents the System Use Case Model.
此图已经在图13中显示过了，并且表示系统用例模型。
The resulting System Use Case model is shown in Figure 13, and includes all the use cases identified.
结果产生的系统用例模型如 图 13所示，并且包括已确定的所有用例。
The thesis describes the system function modules in detail using modular structure, then draws the system use case model on this basic.
本系统采用的是模块化结构设计对系统的功能模块进行了详细的描述，在此基础上绘制了系统模块的用例模型。
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