B1 a long passage under or through the ground, especially one made by people隧道;地道;坑道
the long passage through which football, rugby etc. players walk to get to the pitch(足球或橄榄球等比赛时球员走向球场的)球员通道
More examples
The tunnel was dug with the aid of heavy machinery.
Ten miners were trapped underground when the roof of the tunnel fell in.
The road goes over the mountains, not through a tunnel.
It is not practicable to complete the tunnel before the end of the year.
A tunnel entrance was found within the precincts of the prison camp.
to dig a tunnel开凿隧道;挖地道
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