《徐霞客游记·粤西游日记二十九》
大概是水涨时，山前的水也是从洞外冲人洞中，但今天没有滴水了。
盖水涨时，山前之水亦自洞外捣入者，而今无滴沥也。
Probably when the water rose, the water in front of the mountain also rushed into the cave from outside the cave, but today there is no dripping water.