“空气稀薄”如何翻译地道呢,

空气稀薄:The air is thin.
空气稀薄,天空手帆轮更加苍白,大地也一天天变毕信得苍白起来:
The air was thin and the sky was paler,and every day the earth paled.
稀薄空气轿春:rarefied air
稀薄空气动力学:superaerodynamics
空气稀薄化:rarefaction of air