rarefaction of air 空气稀薄化
bone rarefaction 骨质疏松
Rarefaction Of Bone 骨质疏松
rarefaction quadrant 稀疏像限
rarefaction state [物] 稀疏状态
rarefaction control 水击超前控制
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"a sound wave causes periodic rarefactions in its medium"
以上来源于: WordNet
N the act or process of making less dense or the state of being less dense 疏松
Dam-break flood waves often vary rapidly or even discontinuously, with both rapid and tranquil flow behaviors, as well as both compression and rarefaction waves.
溃坝洪水波通常为迅变或间断流动，同时兼有急流和缓流、压缩波和稀疏波等流态。
Yanqing County forms an orderly urban layout combining rarefaction and density and the garden city scene with both mountain and water and distinctive characteristics.
延庆县城形成了错落有致、疏密结合的城市布局和山水相间、特色鲜明的园林城市风貌。
This is called a rarefaction and is represented by widely spaced dots.
这个区域称为稀疏区，并用疏散的小点表示。
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