以红色出为样例  其余template同样有该问题    编译不通过
 template<typename T    , typename... Ts>
        static void Print(std::stringstream &os, const T &first) {
            os << first;
        }

    template<typename T    , typename... Ts> //错误    6    error C2143: 语法错误 : 缺少“,”(在“...”的前面)
        static std::string Print(std::stringstream &os, const T &first, Ts... args) {//错误    7    error C2061: 语法错误: 标识符“Ts”   
            os << first;
            Print(os, args...);
            return os.str();
        }

    template<typename T    , typename... Ts>
        static std::string Print(T first, Ts... args) {
            std::stringstream ss;
            return Print(ss, first, args...);
        }