大型洞室群
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large group-cavern 大型洞群
large-scale underground cavern group 大型地下洞室群
a large-scale underground cavern group 大型地下洞群
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An ancient man-made near ground surface rock cavern group was found in Longyou County, Zhejiang Province. The 24 large caverns were excavated 2000 years ago.
浙江省西部龙游县的龙游大型古地下洞室群由24个洞室组成，该洞室群开挖于2000年前。
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