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New American Oxford Dictionary

coalfield

coal field |ˈkōlˌfēld ˈkoʊlˌfild | ▶noun an extensive area containing a number of underground coal deposits.

 

Oxford Dictionary

coalfield

coal |field |ˈkəʊlfiːld | ▶noun an extensive area containing a number of underground coal strata.

 

Sanseido Wisdom Dictionary

coalfield

c ó al f ì eld 名詞 C 炭田 .