An underground passage built under a hill ,road , or a River ??
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An artificial underground passage, especially one built through a hill or under a building, road, or river. ... 'Local villagers cut a tunnel road through the mountain and named it Guoliang Cave.
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An artificial underground passage, especially one built through a hill or under a building, road, or river. ... 'Local villagers cut a tunnel road through the mountain and named it Guoliang Cave.
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