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Somewhere on Earth a double rainbow is stretched from one end of the horizon to the other.

地球上的某个地方，双重彩虹正从地平线一端延伸至另一端；

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One way to do that is with a spectrograph, which breaks light into a rainbow of colors; artificial light makes for a different sort of rainbow from the one sunlight produces.

一个判断方法是用光谱仪，它可以将光分成各种颜色，而人造光的颜色排列与阳光是不同的。

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She went to the rainbow-colored trees and looked up at one of them.

VOA: special.2009.07.25

One place the Rainbow Warrior 3 might be going soon, I guess, is Indonesia.

BBC: Greenpeace Rainbow sails again

According to the list, rainbow is one of the happiest words and earthquake is one of the saddest.

CNN: The happiest and saddest states according to Twitter

In part one we look at AIDS awareness in the Rainbow Nation and whether football's world governing body FIFA is delivering on its promise.

CNN: The World Cup's fight against AIDS: Fact or fiction?