父型;
Relationship between subtype and supertype is mutually exclusive.
子类型和父类型之间的关系是互斥的.
The same type cannot be the subtype and the supertype.
同一类型不能既是子类型又是父类型.
Drag onto the page to specify a relationship between a subtype and supertype.
拖到绘图页后,可以指定子类型和父类型之间的关系.
Remember, the supertype relation is reflexive.
记住超类型的关系是反身的.
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