| 单词 | tunnel | 
| 释义 | tunnel1 of 2noun  tun·nel  ˈtə-nᵊl  1  a    : a covered passageway    specifically : a horizontal passageway through or under an obstruction   b    : a subterranean gallery (as in a mine)    c    : burrow   2   : a hollow conduit or recess : tube, well    tunnellike   ˈtə-nᵊl-ˌ(l)īk adjective tunnel2 of 2 verb  tunneled or tunnelled; tunneling or tunnelling ˈtən-liŋ  ˈtə-nᵊl-iŋ intransitive verb 1   : to make or use a tunnel   2  physics   : to pass through a potential barrier  electrons tunneling through an insulator between semiconductors transitive verb   : to make a tunnel or similar opening through or under    also : to make (one's way) by or as if by making a tunnel   tunneler   ˈtən-lər noun ˈtə-nᵊl-ər tunnel nounas in cavea passage that goes under the ground, through a hill, etc. The train goes through a tunnel in the mountain. The moles dug tunnels in the yard. Synonyms & Similar Words Relevance 
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