红绿灯为什么有三种颜色??????用英语解答!

来源：百度知道 编辑：UC知道 时间：2024/05/24 11:28:30
急,速度点!!!!!!!!!!最好一天之内!!!!!!!!!!!!!!!!!!!!!!!!
But why do they have 3 colours?
Because there are ...... ......。Look！It's a red light。Let's stop!
...... ......添什么？？？？？？

in order to release the traffic crowd.the government designed three signals to sovle it.the lights has three color. red means caution,blood. it alert the people to stop!
green means life .the medium color is yellow.

你先告诉我为什么。用中文。我就帮你翻译。

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