This is the 4229th most frequent Chinese word.
大气层
Atmosphere.
In this sentence, 大气层 is used scientifically to refer to the Earth's atmospheric layer.
大气层保护地球免受外层空间的辐射。
The atmosphere protects Earth from outer space radiation.
Here, 大气层 refers to the atmospheric domain closer to Earth's surface, emphasizing its role in aviation.
飞机在大气层中飞行时需要克服空气阻力。
Airplanes must overcome air resistance when flying in the atmosphere.
This usage highlights the essential role of 大气层 as a life-sustaining layer necessary for survival.