在顺序图中，对象框没有名字“：”，这些对象叫做匿名对象。

On the Sequence diagram the object boxes have no name preceding the ":." These are called anonymous objects.

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点一下这个类的名字，你将发现在这个对话框的右边会出现上下箭头。

Click the name of the class and you'll see that up and down arrows appear on the right side of the dialog box.

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然而，组合框显示了一个城市的名字(Austin)。

However, the Combo Box is showing a city name (Austin).

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