water-keeping mining

英 美
  • 保水采煤
  • keeping n.一致;协调动词keep的现在分词形式.
  • mining n.采矿;矿业
  • water n.水;海域;雨水;海水v.给...浇水;给...供水;加水稀释;充满眼泪;给...水喝