tunnel [ˈtʌnl]

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n.隧道，地下道；vi.挖隧道；vt.掘隧道于

a long passage under or through the ground , especially one made by people

They will have to block up the entrance to the tunnel. 他们将不得不封闭通往隧道的入口。
The train passed through a tunnel. 火车通过了一条隧道。