tunnel

n.地道，隧道，管道 v.挖地道(或隧洞)

tumulus, tun, tuna, tundra, tune, tune in, tune in (to), tune out, tune up, tune-up, tuneful, tunefully, tunefulness, tuneless, tunelessly, tunelessness, tuner, tungsten, tunic, tuning-fork, tunnel vision, tunny, tup, tuppence, tuppenny, turban, turbaned, turbid, turbidity, turbine, turbo-jet, turbo-prop, turbot, turbulence, turbulent, turbulently, turd, tureen, turf, turf accountant,