短语词组短语washing sand out 冲砂washing -out 排污;污水;洗去residual washing -out 残渣洗涤slag -washing-out pump 冲渣水泵washing out and separation 洗脱分离hang the washing out 把洗过的衣物晾晒在外面pile washing out 冲桩washing out method 清洗法;洗出法 返回 washing out