保护维护大气圈是紧贴地球表面的一层空气。站在地面上望它,它象碧玉装成的天盖;飞到星际看它,它象环绕地球的轻纱。它不仅把地球装饰得更美丽,而且,还是一道天然屏障,很好地保护着地球。它能使天外飞来的陨石减慢速度,有的变小,有的变成粉末;它能吸收很大一部分紫外线,使射到地面 Protecting and maintaining the atmosphere is a layer of air that clings to the surface of the earth. Standing on the ground and looking at it, it is like a jasper’s sky cover; flies to the stars to see it, it is like a veil around the earth. It not only decorates the earth more beautifully, but also acts as a natural barrier to protect the earth. It can slow down the speed of the meteorite fly out of the sky, and some become smaller, some become powder; it can absorb a large part of the ultraviolet rays and shoot it to the ground.