Despite the caves' perches, high above the river valley, the treasures inside are at risk from looters and souvenir collectors, as well as erosion, earthquakes, and infrequent but torrential rains.

尽管洞窟位于河谷上方的高地，但其中的宝藏还是会遭受来自抢劫者、纪念收藏家的损坏，以及侵蚀、地震和罕见的暴雨的威胁。

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It is concluded that the reason of frequent flooding in the Valley is due to both natural factors such as torrential rain and typhoon rainstorm and also social factors.

从中思考珠江流域洪水频繁的原因，除了暴雨、台风暴雨等自然因素，还受社会因素影响。

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