...生类时将基类的继承方式指定为protected的，称为保护继承，用保护继承方式建立的派生类称为保护派生类(protected derived class)，其基类称为受保护的基类(protected base class)，简称保护基类。
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It has a protected modifier, so it's only available to derived subclasses and within the Lure class itself.
它具有一个受保护的修饰符，所以它只对派生子类可用并且在lure类本身的内部。
Theprotected keyword is a member access modifier. A protected member is accessible within its class and by derived class instances.
只有在通过派生类类型发生访问时，基类的受保护成员在派生类中才是可访问的。
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