Underground car井下汽车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 water handling地下水处理underground movement joint地下工程变形缝underground arch structure地下拱形结构underground lever drainage地下水平排水underground EM wave method地下电波法Underground Explosion Test地下爆炸试验underground parking-area地下停车场underground water pressure地下水压力underground cave -hangar地下洞库underground utility tunnel地下综合管廊