有人在描述未来城市的交通模式时说,未来城市的交通系统要分成许多层,各层运输系统都能正常工作,且互不干扰。比如,一层有自动楼梯与自动人行道供步行,二层供电动汽车行驶,第三层行自行车,第四层行驶高速汽车,第五层跑公共汽车,第六层是地铁。其中自动人行道的出 When describing the transportation mode of the future city, some people said that in the future the transportation system of the city should be divided into many layers and the transport systems at all levels should work normally without interfering with each other. For example, on the first floor there are escalators and moving walkways for walking, on the second floor for electric cars, on the third floor for bicycles, on the fourth floor for high-speed cars, on the fifth floor for running buses and on the sixth floor for the subway. Among them are the moving sidewalks