n.[C]

1. 隧道，地道
   The railroad passes under the mountain through a tunnel.

   铁路穿过隧道从山下通过。

2. （矿场的）坑道，石巷
3. （动物的）洞穴
4. 地沟，涵洞

vt.

1. 在……挖掘隧道
   The workers are tunneling the hill.

   工人们在凿山开隧道。

2. 挖，凿（地道，洞穴等）
   A mole tunneled a hole under the wall.

   鼹鼠在墙脚下面钻了一个洞。

3. 在……打开通道；打开（通道）

vi.

1. 挖掘隧道
   They were tunneling under the river.

   他们在河下挖掘隧道。

2. 打开通道[（+through）]
   The workers were tunnelling through solid rock.

   工人们正在坚石中挖掘一条通道。

3. 【物】隧穿

n.

1. an artificial underground passage, as built through a hill or under a building or by a burrowing animal.
2. a polytunnel.

v.

1. dig or force a passage underground or through something.
2. Physics  (of a particle) pass through a potential barrier.