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 aerial tramway井下死underground heat exchanger埋地换热器underground thermal energy地表热能underground parking garage地下停车场Underground poetry writing地下写作underground control center地下指挥所Underground materials shop地下料仓underground electric cable地下电缆underground traffic circle地下转盘underground transportation井下运输