如果参与者参与通用用例，他是否参与专用用例？
如果参与者参与通用用例，他是否参与专用用例？ 我认为不会，考虑到多态性的类比，父对象指针可以指向子对象，但反之则不然。
我知道反之亦然（如果演员参与专门用例，他也参与通用用例）。
Does actor participates in specialized use case if he's participating in generalized use case?
I think no, given the analogy in polymorphism, where the parent object pointer can point to the child object, but not vice versa.
I know that the other way around is true (if actor is participating in specialized use case he's, as well, participating in generalized use case).
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从元模型来看，参与者和用例都是分类器，它们之间的关系表示为关联。因此，子用例应该继承父用例的所有属性和关联（包括用例和参与者之间的关联）
Looking at the metamodel, actors and use cases are classifiers and the relationship between them is represented as an association. Therefore, a sub-use case should inhrit all the attributes and associations of the parent use case (which includes the association between the use case and the actor)