During the air pollution red alert, the Beijing Commission of Education ordered all kindergartens, primary schools and middle schools to suspend classes.

在空气污染红色预警期间，北京市教委下令让所有幼儿园、小学和中学停课。

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The idea of primary colors, and specifically the idea of red, yellow and blue being the primary colors, didn't exist until about 200 years ago.

原色的概念，特别是以红色、黄色和蓝色作为原色的概念，是直到大约200年前才出现的。

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At this point, Goethe was already a well-known author, so he was easily able to popularize this idea of primary colors, and specifically the idea of red, yellow and blue as THE primary colors.

此时，歌德已经是位很有名的作家了，所以他能很容易就把原色的概念推广出去，特别是把红、黄、蓝作为“三原色”的概念并加以推广。

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Three of these settings correspond to the primary colours red, green and blue, from which all other colours can be constructed.

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If I were a poor person in a red state, my primary issue would be which candidate, including Obama, speaks to my needs.

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Other studies have shown that environments with red as one of the primary colors are conducive to good performance on short-term memory tasks.

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