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 sewer地下污水渠undergroundtunnel地下隧道underground cable地下光缆,地下电缆underground gangs帮会Underground iquid地下流体underground store地下商场Underground pests地下害虫underground pipes地下管线underground shove地下机铲underground crack地裂缝