tunnelern.隧道掘进机tunneln.隧道；地道；洞穴v.挖地道；挖隧道tunnel junction隧道结tunnel recovery隧道修复tunnel crossing隧道下穿tunnel carriage隧道开掘车tunneling model隧穿模型Tunnel protocal隧道协议tunnel drainage隧道排水tunnel platform轴隧平台tunnel pavement隧道路面tunnel spillway隧道排水槽