词典释义：
an artificial underground passage, especially one built through a hill or under a building, road, or river
人工地下通道（尤指隧道、地道、坑道）。
an underground passage dug by a burrowing animal
（动物）洞穴通道。
[in sing.]a passage in a sports stadium by which players enter or leave the field
运动场运动员通道。
short for
（义项１）的简称。
a long, half-cylindrical enclosure used to protect plants, typically made of clear plastic stretched over hoops
（尤指用透明塑料所作的，套在箍圈外以保护植物的）套管。
[no obj., with adverbial of direction]dig or force a passage underground or through something
挖地道，打开通道
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he tunnelled under the fence 他在篱笆下面挖了个地道
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(
tunnel one's way )the insect tunnels its way out of the plant. 昆虫从植物中打洞钻了出来。
[no obj.]
【物理】 （粒子）穿透势垒，隧（道贯）穿。
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light at the end of the tunnel 见LIGHT 1 .
"late Middle English （in the senses ‘tunnel-net' and ‘flue of a chimney’）： from Old French
