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.

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Remember, the supertype relation is reflexive.

记住超类型的关系是反身的.

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Relationship between subtype and supertype is mutually exclusive.

子类型和父类型之间的关系是互斥的.

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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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