rarefied aerodynamics

例句：

1. 1.The air was rarefied as we climbed higher.
   随着我们爬得越来越高，空气变得稀薄了。
2. 2. The soil is rarefied by the rainwater.
   雨水使得土壤变得稀薄。
3. 3. The rarefied atmosphere is a sign of high altitude.
   稀薄的大气是高海拔的标志。