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城市轨道交通是一种封闭式独立运输系统,不仅是改善城市交通拥挤状况、优化交通运输结构的重要手段,还具有节约土地、节省能源等优点,因此,我
Urban rail transit is a closed independent transport system. It is not only an important means to improve urban traffic congestion and optimize the transport structure, but also has the advantages of saving land and saving energy. Therefore, I