红绿灯交通指挥灯 traffic lights
红绿灯、交通灯 traffic lights
红灯交通灯
Red light
以上为机器翻译结果，长、整句建议使用 人工翻译 。
如果交通灯变为红灯， 车辆必须停止。
If the traffic lights are red, the traffic must stop.
youdao
红灯亮时，你必须在交通灯前停下。
You must stop at the traffic lights when they are red.
比如，为什么不在交通灯杆上安装监控摄像机来防止人们闯红灯呢？
Like if people jump the traffic lights, I don't know why there isn't a camera at the traffic lights to stop people from doing that.
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