They have a lot of colors, some as red, yellow and purple.

有很多种颜色的，有红的，黄的和紫的。

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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。

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We could do some activities among our classmates, such as telling the history of our Party, reading poems, singing red songs and so on.

我们可以在同学中开展一些活动，比如讲党史，读诗，唱红歌等等。

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Poles still view the Red Army invasion as an act of aggression, especially the Katyn Forest massacre, in which some 22,000 Polish soldiers, police and intellectuals were murdered by Soviet forces in 1940.

VOA: standard.2009.09.01

Once you get that, once you get the value, "Christmas tree," as opposed to "red lights," "red lights" being perhaps a part of some Christmas trees, then you see that you're back in a semiotic system and a very obvious one, because a Christmas tree is a not-menorah, not-Kwanzaa candles.

一旦认识到这点，红灯，指的其实是圣诞树“,红灯是圣诞树的一部分，那么你会发现你回到了符号学的解释中，圣诞树不用于犹太教或者非洲人的节日。

耶鲁公开课 - 文学理论导论课程节选

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