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