• 地下通道

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 shopping mails地下商场underground cable terminal人孔中的电缆终端箱underground launching silo地下发射井underground retaining wall地下连续墙underground water recharge地下水回灌underground mining methods井下采矿法分类underground business space地下商业空间underground filling system井下充填系统underground headstock gear地下式启闭机房underground waste disposal地下处理