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单词 ppb
释义

WordReference Random House Unabridged Dictionary of American English © 2024
PPB, 
  1. Printing(in publishing) paper, printing, and binding.
Also, P.P.B. 
ppb, 
    1. Printing(in publishing) paper, printing, and binding.
    2. Weights and Measuresparts per billion.
    Also, p.p.b. 
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