If a class method is called for a derived class, the derived class object is passed as the implied first argument.

如一个类方法被派生类调用，派生类对象将被隐含的做为第一个参数传递。

youdao

If a class method is called for a derived class, the derived class object is passed as the implied first argument.

如一个类方法被派生类调用，派生类对象将被隐含的做为第一个参数传递。

youdao