parts per billion

US 
UK 
  • un.十亿分之几
  • Web十亿分率;十亿分之一;千万分之一份
un.
1.
十亿分之几

Sample Sentence

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