说明：标识类或接口的所有已声明成员的集合。不包括继承成员。

Identifies the set of declared members of a class or interface. Inherited members are not included.

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任何用protected关键字声明的成员只对定义它的类型，包括其实例和任何继承类型可见。

Any member declared with the protected keyword is visible only to the defining type, including other instances of the same type and any derived types.

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类的成员包括在类中声明的所有成员，以及在该类的继承层次结构中的所有类中声明的所有成员(构造函数和析构函数除外)。

A class's members include all the members declared in the class, along with all members (except constructors and destructors) declared in all classes in its inheritance hierarchy.

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