2. 外语
  3. Rainbow A rainbow is a circle of colors that appears in the sky when sunlight shines on raindrops. / The sunlight and water

Rainbow A rainbow is a circle of colors that appears in the sky when sunlight shines on raindrops. / The sunlight and water

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答案 Rainbow A rainbow is a circle of colors that appears in the sky when sunlight shines on raindrops. / The sunlight and water work together to form rainbows. / Think of sunlight flowing out in many lines, called rays. / The rays are an equal distance from each other. / The light energy of the rays acts similar to waves, which have different lengths. / Sunlight is made up of several wave lengths. / People see the mix of lengths as what is called white light. / But things change when a ray of white light hits a raindrop. / That is when the colors that make up white light slow to different speeds. / The light bends as it enters the raindrop. / This bending separates the white light into colors, / each color weakening as it moves into the next color. / The light rays turn or bend again / when they come out of the raindrop. / This continuous bending through an area of raindrops is what makes the rainbow a perfect circle. /
解析     彩虹
   彩虹是阳光照射到空气中的水滴里，发生光的色散和折射而形成的一种自然现象，雨后常见。阳光和水汽相互作用，在天空中形成美丽的弧形彩色光带。光射进雨滴时会发生弯曲，从而将白光分成了不同颜色的光线，而每种色光进入下一种色光时都会逐渐变弱。当光线穿出雨滴时，它们会再次改变方向并发生弯曲。光线通过一大片充满雨滴的区域时所产生的这种连续弯曲现象使彩虹呈现出完美的弧形。
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