return air of mine矿井回风
compressed-air in mine矿山压气
air driven mine car loader风动矿车装载机;矿山风动装车机
fuel-air explosive mine neutralization system燃料空气炸药扫雷器
air conditioning in mine矿井空气调节
air delivery land mine空投地雷
Seeking Air Mine搜空地雷
air mine laying空中布雷
air flow in mine矿井风流