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In 1920, the world's first three-color traffic light was put to use.
1920年，世界上第一个三色交通灯投入使用。
As for red, it is the color which usually shows warning, as a result, some traffic signs use this color.
至于红色，它通常是表示警告的颜色，因此，一些交通标志会使用这种颜色。
Since yellow is the most eye-catching color, it can catch people's attention, especially in heavy traffic.
由于黄色是最引人注目的颜色，所以尤其在交通拥堵的时候，黄色能吸引人们的注意力。
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