通常以电能为动力，采取轮轨运转方式的快速大运量公共交通总称为轨道交通。
Usually, rapid public transport and large volume of traffic with electric energy power and by wheel running mode is referred to as rail traffic.
城市轨道交通具有快速、便捷、大运量的特点。
Urban rail transit system is characterized by its high-speed, convenience and large carrying capacity.
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