The region of the atmosphere below90km has a nearly constant mean molecular mass and is therefore called the homo sphere.
90公里以下大气区域，具有一个接近恒定的平均分子质量，因此称为均匀层。
2
A good example of this is found in the kinetic molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion.
分子运动理论便是我们能找到的一个很好的例子。在这个理论中，气体被描绘成由许多不断运动的小颗粒组成。
3
Its molecular constituents are in constant violent agitation.