Figure 7: Design SQD of Reserve a vehicle.

图7：第一部分中预约车辆的设计序列图。

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Figure 9: Design SQD for second part of Reserve a vehicle.

图9：预约车辆第二部分的设计序列图。

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We have mapped out quite a bit of interaction in this SQD, and we have discovered more operations on our classes.

我们在这张序列图里已经画出了不少交互，也发现了类中更多的操作。

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