Remember, the supertype relation is reflexive.
记住超类型的关系是反身的.
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.
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