undergroundadj.地下的;秘密的adv.在地下;秘密地n.地下;地铁;地道;秘密活动
underground engineering surrounding rock地下工程围岩
underground curtain without interior wall地下连续墙
underground radio wave penetration method坑道无线电波透视
Underground Training Center Bowling Alley地铁培训中心保龄球馆
underground power supply and distribution井下供配电
underground distribution system-through穿贯式地下布线系统
underground excavation under shallow cover浅埋暗挖技术
underground excavation under shallow eover浅埋暗挖