Coalen.科尔
coaln.煤;木炭vt.烧成炭;供应煤vi.加煤;装煤
coal storage煤储存,储煤,煤场
coal species煤种
coal residue煤渣
coal-floor煤层
coal handing输煤地道
coal weigher煤磅
coal - ash粉煤灰
coal geology煤的地质学
coal or rock煤岩
Coal leakage跑煤