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单词 nanogram
释义

WordReference Random House Unabridged Dictionary of American English © 2024
nan•o•gram  (nanə gram′, nānə-),USA pronunciation n. 
  1. Weights and Measuresone billionth of a gram. Abbr.: ng
  • nano- + -gram2 1950–55

Collins Concise English Dictionary © HarperCollins Publishers::
nanogram, nanogramme /ˈnænəʊˌɡræm/ n
  1. one billionth (10–9) of a gram
    Symbol: ng
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