This diagram represents…and therefore shows that…
该图表显示，…和…期间有越来越多的…
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。
In this diagram, the "qualifications " message likely represents a series of messages sent to the Student object.
在本图中，“ qualifications ”消息可能表示发送到Student对象的一系列消息。
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