rarefactionn.
rɛrə'fækʃən
中文n. [声] 稀疏；（气体）稀薄
词根词源
rarefaction (n.)c. 1600, from Middle French raréfaction or directly from Medieval Latin rarefactionem (nominative rarefactio), noun of action from past participle stem of Latin rarefacere (see rarefy). Used chiefly in reference to gases.
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