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 perforated drainpipe system地下花管排水系统
underground combinatory confined spaces地下组合受限空间
Underground prefabricate diaphragm wall地下连续墙
underground pipeline information system地下管线信息系统
underground structure group construction地下洞室群施工
Underground Security Storage Association地下安全仓储协会
underground personnel positioning system井下人员定位系统
underground water quality evolution rule地下水水质演化规律
underground passages/caves/streams地下通道/洞穴/溪流