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unique_ptr<Node>:将Node类型的next与prev字段改为unique_ptr<Node>与 raw pointer 类型。List的Node进行拷贝。Node的构造函数:改用 member list initialization 并初始化所有成员,尤其是 raw pointer 的初始化。这里不用 explicit 修饰 constructor 是觉得代码中没有这类的隐式构造,我觉得暂时无必要。