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在城市里的各个交通路口,我们几乎都能看到红、黄、绿三色信号灯。红灯停、绿灯行,正因为有了这种交通信号灯,行人、车辆才能按规矩有秩序地在马路上行走和行驶。
At all traffic junctions in the city, we can almost see the red, yellow and green three-color lights. Due to the traffic lights, pedestrians and vehicles can walk and drive on the road in an orderly manner.