When the function is called through a derived object, the arguments must match a version of the function defined in the derived class.
当调用派生对象的函数时，实参必须和派生类中函数定义相互匹配。
When the function is called through a derived object, the arguments must match a version of the function defined in the derived class.
当调用派生对象的函数时，实参必须和派生类中函数定义相互匹配。
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