ppb

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  • abbr.(=parts per billion)十亿分之一
  • Web十亿分率;十亿分之几;十亿分之一浓度
abbr.
1.
(=parts per billion)十亿分之一

Sample Sentence

Definition:
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard