1)tail development,尾开发2)extraction of useful minerals from tailings,开发尾矿3)turning red and breaking in tail,尾部发红开裂4)tailings mining,尾砂开采5)crack in dovetail keyway,燕尾开裂6)mining of tailing,尾矿开采
用法例句
Repairment of crack in dovetail keyway of C_(13-1) type 1 t double columns steam hammer head;