英语词汇“ppb”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	ppb
释义	> as lemmas ppb ppb n. (also P.P.B.) parts per billion. ΚΠ 1929 Science 21 June 651/1 (table) Iodine in Plants..Feedstuffs..No. of Samples..P.P.B. iodine av. 1956 J. Cholak in P. L. Magill et al. Air Pollution Handbk. xi. 10 The normal fluoride content of the atmosphere is extremely low (2 to 8 ppb). 1990 C. Rose Dirty Man of Europe (BNC) 120 During 1976, when the weather was warm and dry, record-breaking ozone levels were detected, reaching over 200 ppb and exceeding 60 ppb on half the summer days. extracted from Pn. < as lemmas
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英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。

> as lemmas