rarer adj.稀罕的；珍貴的形容詞rare的比較級形式.rareness n.稀罕；珍奇；稀薄rarely used spare parts [機(jī)械工程]不常用備件[計算機(jī)科學(xué)技術(shù)]不常用備件rarely seen 很少見到 罕見rarely if ever 幾乎從不rarely (adv.) rarely adv. 很少地；難得；罕有地rarefying 抽稀rarefy (v.) rarefy vt.使變稀少；使變純淨(jìng)vi.變稀薄=rarify.rarefies 抽稀rarefied zone [化學(xué)]稀薄區(qū)rarefied gas [流] 稀薄氣躰rarefied adj. 高深精妙的，曲高和寡的；遠(yuǎn)離常人生活的，怪異的；（空氣）稀薄的，含氧量低的rarefication n.稀薄rarefiable vt.使變稀少；使變純淨(jìng)vi.變稀薄=rarify.rarefactor 松弛器rarefactive adj.稀少的(膨脹的)rarefactional adj.稀少的(膨脹的)rarefaction wave [流] 稀疏波；膨脹波；餘波