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将近2500年的36个人工洞窟,各自独立。到底最初是为什么而开凿它们的?当地人都没有想到:在自己家自留山的山肚里居然有这么多地下石窟,大的甚至比两个足球场还要大。
Nearly 2500 artificial caves 36, each independent. In the end why did they dig their first? The locals did not think: There are so many underground caves in the mountains of their own mountains, big even more than two football pitches.