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  • un.煤层下分层的上部
  • Web顶底;上下;上衣底摆
un.
1.
煤层下分层的上部

Sample Sentence

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