A young man has his own ambition, when he promises to be the first in the world! 　　This is the story of a man with a hanged man, beating the whole world in the field of technology! Generally speaking, the atmosphere in the sky is divided into five layers, namely the troposphere, stratosphere, mesosphere, thermosphere and escape layer. 　　The troposphere is the lowest layer of the atmosphere, about 10 to 16 kilometers from the ground, and this layer concentrates about 75% of the atmospheric mass and almost all of the amount of water vapor, and is therefore the only layer of the atmosphere where weather weather occurs. 　　Generally airplanes naturally choose to avoid the troposphere, where resistance is high and weather is variable. Civilian airplanes, for example, fly to altitudes of 8,000 meters to 10,000 meters to get a smoother flight. 　　As for why they do not fly to the stratosphere, it is because civil aircraft are generally only ordinary turbofan engines, which require oxygen to fuel combustion, and it is easy to go to the stratosphere to "lack of oxygen"!

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