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单词 ready reckoner
释义

WordReference Random House Unabridged Dictionary of American English © 2024
ready reckoner, 
  1. Mathematicsreckoner (def. 2).
  • 1750–60

Collins Concise English Dictionary © HarperCollins Publishers::
ready reckoner n
  1. a table of numbers used to facilitate simple calculations, esp one for applying rates of discount, interest, charging, etc, to different sums
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