rear guard
基本释义
后卫部队
实用场景例句
声学研究
The rarefaction waves caused by the explosion were measured by sensors.
传感器测量了爆炸产生的稀疏波。
气象学讨论
Rarefaction in the atmosphere affects how sound travels over long distances.
大气中的稀薄作用影响了声音传播的远距离。
物理学学术讨论
The rarefaction of air in the vacuum chamber was extreme.
真空室中空气的稀薄程度极高。
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