Association: An association element represents the relationship between two end classes.
关联：一个关联元素代表了两个端点类间的关系。
Add a One-to-One Association relationship between these two classes, as shown in Figure 4.
在这两个类间添加一个一对一的关联关系，如图4所示。
Of course you have to sacrifice the association between the super class and other classes.
当然你不得不牺牲超类与其他类之间的关联。
Of course you have to sacrifice the association between the super class and other classes.
当然你不得不牺牲超类与其他类之间的关联。
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