The still air of the stratosphere contains the ozone layer, which was created when ultraviolet light caused trios of oxygen atoms to bind together into ozone molecules.
平流层大气包含臭氧层，臭氧层由紫外线照射导致的三个氧原子结合成的臭氧分子组成。
Air in the atmosphere's outermost layer is very thin, but air molecules still create drag that slows down satellites, requiring engineers to periodically boost them back into their proper orbits.
大气最外层的空气非常稀薄，但空气分子仍能产生阻力减慢人造卫星的速度，这样工程师们就得定期把它们推回到其正确的轨道上。
The dirty, still air covers los angeles like a blanket , gradually building up into a thick, smelly, foggy, smokelike layer.
尘污和静止的空气象一个罩子一样覆盖著洛杉矶，逐渐形成了一个浓密的带有臭味的，雾蒙的烟层。
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