时间:2019-01-10 作者:英语课 分类:与美国小学生一起学英文第10册


英语课

   Prisms 棱镜


  Why can we see rainbows after rain? 我们雨后为什么能看到彩虹?
  We can see rainbows after rain because droplets 1 of moisture in the air work like a big prism. 这是因为空气中的水滴就像一个大棱镜。
  So what is a prism? 那么什么是棱镜呢?
  It is a piece of glass. It usually has a triangular 2 shape. 它是一块玻璃,通常有三角。
  What does the prism do? 棱镜的作用是什么?
  It reflects and separates light. 它能反射和分散光线。
  When we look at sunlight, it seems white. 我们看阳光时,它似乎是白色的。
  However, if you see sunlight through a prism,  但如果你透过棱镜看到阳光的话,
  you'll know that there are different colours from red to violet in the white light, just like a rainbow. 你就会知道,白光中有不同的颜色,从红到紫,就像彩虹一样。
  Because of prisms, we know that sunlight is a mixture of different colours. 因为棱镜,我们知道太阳光是不同颜色的混合物。

n.小滴( droplet的名词复数 )
  • Droplets of sweat were welling up on his forehead. 他额头上冒出了滴滴汗珠。 来自辞典例句
  • In constrast, exhaled smoke contains relatively large water droplets and appears white. 相反,从人嘴里呼出的烟则包含相当大的水滴,所以呈白色。 来自辞典例句
adj.三角(形)的,三者间的
  • It's more or less triangular plot of land.这块地略成三角形。
  • One particular triangular relationship became the model of Simone's first novel.一段特殊的三角关系成了西蒙娜第一本小说的原型。
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