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彩虹是人们时常看到的一种自然界的光现象。每当五彩缤纷的彩虹当空挂时,人们都会情不自禁地争相观赏这种大自然美景。你知道彩虹是如何形成的吗?一说到彩虹的形成,人们常把它跟雨后联系在一起。很多人
Rainbow is a kind of natural light that people often see. Whenever colorful rainbow hanging, people can not help but competing to watch this natural beauty. Do you know how a rainbow is formed? When it comes to the formation of a rainbow, it is often associated with the rain. A lot of people