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-现代词典

单词	ppb
释义	ppb in American English parts per billion Examples of 'ppb' in a sentence ppb Concentrations of methane have risen from 700 parts per billion (ppb) to 1,745 ppb. Times, Sunday Times (2009) Laboratory analysis is done on samples that are 100 ppb and below using atomic absorption spectrophotometry. The Scientist (2000)
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ppb in American English