Grammar Note
可数名词，复数形式为 tunnels；表示从某物内部或下方穿过时常用介词 through/under，表示在某通道内部时用 in。
隧道
先理解核心含义，再看它在真实句子里的用法。
隧道
An underground or underwater passage, especially one for cars or trains, or a passage through or under an obstacle.
The train went through a long tunnel under the mountain.
火车穿过了一条很长的山底隧道。
地下通道
An underground or underwater passage.
通过或在某物下的通道,通常是地下的(尤其是火车或汽车用)
a passageway through or under something, usually underground (especially one for trains or cars)
穿过障碍的通道
A passage through or under some obstacle.
动物为栖息而挖的洞
a hole made by an animal, usually for shelter
The rabbit disappeared into a small tunnel in the ground.
兔子钻进地里的一条小地洞。
AI contextual example
Drivers should turn on their lights when entering the tunnel.
司机进入隧道时应打开车灯。
AI contextual example
the tunnel reduced congestion at that intersection
隧道减轻了那个路口的拥堵。
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可数名词，复数形式为 tunnels；表示从某物内部或下方穿过时常用介词 through/under，表示在某通道内部时用 in。
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 3，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.