此图已经在图13中显示过了，并且表示系统用例模型。
This diagram has already been shown in Figure 13, and represents the System Use Case Model.
用例模型有两种基本风格：基本用例模型和系统用例模型。
There are two basic flavors of use case models: essential use case models, and system use case models.
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 resulting System Use Case model is shown in Figure 13, and includes all the use cases identified.
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