《徐霞客游记·浙游日记下》
下层就是山涧水流出去的地方，涧中水已经干涸，但出了洞几步，就有水溢到涧中，这大概是因为水流被水礁引出到洞侧面的缘故。
下层即水涧所从出，涧水已涸，出洞数步，即有水溢于涧中，盖为水碓ì石臼引出洞侧也。
The lower level is where the mountain stream flows out. The water in the stream is dry, but a few steps out of the cave, there is water overflowing into the stream. This is probably because the water flow is led to the side of the cave by the reef.