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空气稀薄:The air is thin.
空气稀薄,天空更加苍白,大地也一天天变得苍白起来:
The air was thin and the sky was paler,and every day the earth paled.
稀薄空气:rarefied air
稀薄空气动力学:superaerodynamics
空气稀薄化:rarefaction of air