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单词 tufa
释义 tufa
 —tufaceous /tooh fay"sheuhs, tyooh-/,  adj.  
 /tooh"feuh, tyooh"-/, n. Geol.
  1. Also called calcareous tufa, calc-tufa, calc-tuff. a porous limestone formed from calcium carbonate deposited by springs or the like. Cf. travertine.
  2. (not in technical use) tuff2.
 [1760-70; < It tufo < L tofus]
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