tunnels
n.
隧道，地道( tunnel的名词复数 );
（动物栖息的）穴;
例句:
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They found a labyrinth of tunnels under the ground.
他们发现了一处迷宫似的地道。
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All that digging had left a network of abandoned mines and tunnels.
东挖西掘后留下了一片废弃的矿坑。
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The tunnels have been widened and deepened.
各条隧道都已拓宽加深。
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Without the tunnels, things would be far worse.
来自VOA
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Lines, sidings, embankments, tunnels and what-not.
来自J. Wain
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They had honeycombed the island with tunnels and caves.
来自Sloan Wilson