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单词 rottenstone
释义

WordReference Random House Unabridged Dictionary of American English © 2024
rot•ten•stone  (rotn stōn′),USA pronunciation n. 
  1. Rocksa friable stone resulting from the decomposition of a siliceous limestone, used as a powder for polishing metals.
  • rotten + stone 1670–80

Collins Concise English Dictionary © HarperCollins Publishers::
rottenstone /ˈrɒtənˌstəʊn/ n
  1. a much-weathered limestone, rich in silica: used in powdered form for polishing metal
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