You can define an inheritance relationship if none exists.
如果不存在任何继承关系，则可以定义一种继承关系。
The abstract class is the base class in an inheritance relationship with another class.
抽象类是与另一个类有关的继承关系中的基类。
In Figure 7, almost every relationship is a use apart from the inheritance.
在图7中，几乎所有的关系是use除去继承关系。
In Figure 7, almost every relationship is a use apart from the inheritance.
在图7中，几乎所有的关系是use除去继承关系。
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