rarefication

n.=rarefaction

稀薄化；变稀薄；变疏松

名词

1、The rarefaction of air at high altitudes can cause breathing difficulties for some individuals.
高海拔地区空气的稀薄化可能会导致一些人呼吸困难。
2、The process of rarefication in the outer atmosphere allows spacecraft to travel through with ease.
大气层外的稀薄化过程使太空船轻松穿越其中。