| 单词 | rarefaction |
|---|---|
| 音标 | [`reəri'fækʃən] |
| 解释 | n.稀薄 |
| 红宝书 | 【考】 refine : purification / attenuate : rarefaction(同义：提纯→纯化/ 使稀薄→稀薄)反义词：condensatio n(浓缩) 【记】 rarefy（使稀薄）+ac tion |
| 字源 | 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. |
| 不择手段背单词 | n. 稀薄化 【记】源于: rare(adj 稀罕的) 【类】refine: purification = attenuate: rarefaction提纯 = 使稀薄(同义) 【反】condensation(n 浓缩) |
| 趣味全助记 | 【记】rarefy |
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