一、天空是蓝色的 天空并不是空的,它由很多很多微粒 组成,其中百分之九十九是氮气和氧气, 其他是来源于汽车的废气、工厂的烟雾、 森林火灾或火山爆发出来的岩灰等气体 微粒和微小的漂浮微粒。这些微粒很小, 一般只有一滴雨水的百分之一,但是它们 也照样能阻挡阳光的去路,光线从这些众 多的小“绊脚石”上弹回,自然也就改变 了自己的方向。 太阳光中的红光和橙光的波长比较 长,当波长较长的红光和橙光碰到空气中 First, the sky is blue The sky is not empty. It consists of many, many particles. Ninety-nine percent of them are nitrogen and oxygen. Others are emissions from cars, factory smoke, forest fires, or volcanic eruptions. Rock dust and other gas particles and tiny floating particles. These particles are very small, generally only one percent of a drop of rainwater, but they can still block the way out of the sun. The light bounces back from these many small stumbling blocks and naturally changes their direction. The wavelengths of red and orange light in the sunlight are relatively long. When the longer wavelengths of red and orange light hit the air