Coali夸利
coaln.煤;木炭vt.烧成炭;供应煤vi.加煤;装煤
coal pyrite碳质黄铁矿
coal digger采煤工
coal boiler燃煤锅炉
coal to oil煤制油
coal famine煤荒
coal-drop卸煤机
coal slurry煤泥
coal pillar煤柱
coalescencen.接合;结合;合并
coal layers含煤地层