Member template functions cannot be virtual functions and cannot override virtual functions from a base class when they are declared with the same name as a base class virtual function.
当使用与基类虚函数相同的名称进行声明时，成员模板函数不能是虚函数并且不能从基类重写虚函数。
Template functions are always specified with fully parameterized types.
模板函数总是用完全参数化的类型指定的。
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