短语词组短语decomposed outcrop 分解露头;[矿业]风化分解露头;风化分解露头seam outcrop 煤层露头outcrop mine 露头矿subterraneous outcrop 掩盖露头outcrop curvature 露头洼曲coal outcrop 露头煤;煤炭沙砾河床;煤炭露头boundary outcrop 界线露头buried outcrop 隐臧露头;埋没露头 返回 outcrop