The member functions of an object are the interface events that trigger state transitions, and actions associated with state transitions constitute the body of the member functions.
而对于引起状态迁移的接口事件，则可以通过对象类中的成员函数来完成，成员函数体的主要功能就是实现状态迁移中发生的一系列活动。
The member functions of an object are the interface events that trigger state transitions, and actions associated with state transitions constitute the body of the member functions.
而对于引起状态迁移的接口事件，则可以通过对象类中的成员函数来完成，成员函数体的主要功能就是实现状态迁移中发生的一系列活动。
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