每到夏天,雨过天晴之后,天空往往会出现一道五颜六色的彩虹,似乎是哪位仙女拿着绚丽多彩的丝绸在天空中翩翩起舞。这时,我脑海中就会想起毛主席的诗句:“赤橙黄绿青蓝紫,谁持彩练当空舞?”那景象真令人心旷神怡。那么,彩虹到底是怎样形成的呢?带着这个问题,我找到了我们的自然 Every summer, after the rain, the sky often appears a colorful rainbow, it seems which fairy is holding colorful silk in the sky dancing. At this time, my mind will think of Chairman Mao's poem: “red orange yellow green purple, who held the practice of empty-field dance?” That scene is really relaxed and happy. So, how is the rainbow formed? With this question, I found our nature