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upper air

US 
UK 
  • un.高空;高层空气
  • Web借指高空;高空高层空气
un.
1.
高空
2.
高层空气

Sample Sentence

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