英语词汇“ppb”是什么意思，“ppb”的读音、用法及例句翻译-烛光网

词汇	ppb
释义	ppbabbr.（略语） Parts per billion.十亿分率，十亿分之…
随便看	grow growed growing growing pains growl growl grow lamp growled growler growlers grow light growling growls grown grown grownup grown-up grown–up grows growth growth company growth factor growth fund growth hormone growth ring

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