coalpitn.煤坑;炭灶
coaln.煤;木炭vt.烧成炭;供应煤vi.加煤;装煤
coal mining the tunneling连采掘进
Coal sliding down a chute煤从滑道上滑下来
coalfield collapse column煤田陷落柱
Coal - dependent Cities煤炭城市
coal gasification project粉煤气化项目
coal-bearing properties含煤性
coal mining under a river河流下开采
Coal mine safety accident煤矿安全事故
coal accumulating pattern聚煤规律
coal resource integration煤炭资源整合