Why traffic lights are red, yellow and green？

为什么交通灯是红、黄、绿三种颜色的？

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Color four squares into red, yellow, blue or green.

给四个正方形涂色：红色、黄色、蓝色或绿色。

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Some flowers are red, yellow and blue, and others are white.

一些花是红的，一些是黄的，一些是蓝的，其它的是白的。

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He thought of his room with its horrible yellow wallpaper, the old bed with its ugly red cover.

VOA: special.2009.04.04

And I'm sure you can imagine that if you want to label onw protein green and one red and one yellow, now you can start looking at really complex biological processes.

我相信你们可以想象如果你,需要把一个蛋白质标记成绿色,一个标记红色，一个标记黄色，这样你就可以研究非常复杂的生物学过程。

麻省理工公开课 - 化学原理课程节选

You'll see a graph with yellow lines, yellow bars that are people without the metabolic syndrome and red bars are people with.

图上黄色柱子表示没有患代谢综合征的人,红色柱子表示患有代谢综合征的人

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The line of sprinters in alternate lanes of red and yellow (USA in red, Jamaica in yellow) squeezed every sinew to keep up with the new pacemaker.

CNN: Olympic Bolt: Witness report of historic 100m

Ms. Potiwat uses the red and yellow flowers for their astringent flavor, adding that the red ones have a relaxing effect when eaten.

WSJ: Flowers for the Eyes, and the Mouth

Hues of red and yellow will mark the Chinese New Year while Polish Independence Day will see the city hall turned red and white.

BBC: Rays of light over Belfast City Hall