Show an abstraction class diagram by selecting a class from the abstraction list.
从抽象结构表中选择一个类从而显示其抽象类图。
The classes except for the discovered abstraction class do not have attributes and operations.
除去被发现的抽象类之外，其他类没有属性及操作。
Producing high-level abstraction class diagrams with aggregation and association relationships
产生具有聚合及关联关系的高层抽象性的类图
Producing high-level abstraction class diagrams with aggregation and association relationships
产生具有聚合及关联关系的高层抽象性的类图
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