Why use a red stop signal?

为什么停车信号要用红色？

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Cross the road. Look! The traffic light's red. Stop!

过十字路口。看！这红绿灯是红的。停止！

youdao

Red, red, the light is red. Stop, stop, stop.

红灯红灯，红灯亮了，停停停。

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The red "stop" sign is frequently seen in US.

那个红色的“停车”标志在美国非常常见。

youdao

The red "stop" sign is frequently seen in US.

那个红色的“停车”标志在美国非常常见。

youdao