Why does the sky look blue?

为什么天空看起来是蓝色的？

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In fact, the sky has no color. Then why does the sky look blue?

事实上，天空没有颜色。那为什么天空看起来是蓝色的呢？

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In infrared light, shorter wavelengths look blue, and longer wavelengths appear red.

红外光下，较短的波长会程现蓝色，而较长的波长则程现红色。

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In time, Paul and Babe the Blue Ox left Maine, and moved west to look for work in other forests.

VOA: special.2009.01.24

Remember that this molecule, let's look at the blue one wouldn't be the same if I turned it upside down.

让我们记住,如果我把蓝色的,单链倒过来,那么这条链和原来不一样了

耶鲁公开课 - 生物医学工程探索课程节选

I hate to say this, but you don't look good in blue.

我真不太想说，但是你穿蓝色不是很好看啦。

I hate 实战 - SpeakingMax英语口语达人

Diamonds look best under blue-tinged white light, while gold shows better in warmer tones.

FORBES: Magazine Article

Contrary to the "gel" part of its name, aerogels are highly porous solids that look like frozen blue smoke.

FORBES: Magazine Article

Nobody loves a bargain more than Wall Street, and Zynga is starting to look like a blue-light special.

FORBES: Zynga Spikes; Suddenly, Investors See A Raging Bargain