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coal bed

US 
UK ['kəʊlbd]
  • na.煤层
na.
1.
煤层

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