... 稀薄 = rarefaction 稀薄 = rarefactions 稀薄 = rarefies ...
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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
rarefaction wave 稀疏波;膨胀波;余波
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