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1. Oxford American Dictionary

   tunnel

   • IPA[ˈtən(ə)l]

   美式

   • n.
     an artificial underground passage, especially one built through a hill or under a building, road, or river.；an underground passage dug by a burrowing animal.
   • v.
     dig or force a passage underground or through something；(of a particle) pass through a potential barrier.

   • verb: tunnel, 3rd person present: tunnels, gerund or present participle: tunnelling, past tense: tunnelled, past participle: tunnelled

2. • 釋義

   n.

   名詞

   • 1. an artificial underground passage, especially one built through a hill or under a building, road, or river.
   • ▪ an underground passage dug by a burrowing animal.
   • ▪ a passage in a sports stadium by which players enter or leave the field.

   v.

   動詞

   • 1. dig or force a passage underground or through something he tunneled under the fence the insect tunnels its way out of the plant
   • 2. (of a particle) pass through a potential barrier.