内容简介：五个人受雇在公路上喷涂交通黄线。

Five men are hired to paint the lines of a road.

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为什么交通灯是红、黄、绿三种颜色的？

Why traffic lights are red, yellow and green？

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严禁擅自打开警示绳或越过安全黄线，进入轨道交通道床、隧道，这种行为不仅会严重威胁您的生命安全，也将对运营安全和公共安全造成严重影响。

Jumping into the tunnel is prohibited. This behavior is very dangerous and will severely disrupt the subway system.

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Now in a stoplight, it only has three, one is tempted to say, variables plainly differing from each other: red, yellow and green we have two ways of thinking about the red light.

交通灯，三种灯，红黄绿，它们的颜色和彼此不能,我们有两种方式认识红灯的意思。

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