coalfield 隐藏摘要 
煤田
coal seam 煤层
coalfield 煤田
coarse texture soil 粗质地土壤
http://www.zftrans.com/favorite/vocabulary/2006-2/1/212706212127131594940.htm - 基于70个网页
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exposed coalfield  
submarine coalfield  
concealed coalfield  
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