《徐霞客游记·浙游日记下》
持着烛火进到深处，左边有一个孔穴，如同夹室，顺着它曲折向前，夹缝尽头处有水往下滴，然而缝隙底部仍然是干燥的，不知水流到哪儿去了。
秉烛深入，左有一穴如夹室，宛转从之，夹穷而有水滴沥，然隙底仍燥，不知水从何去也。
Holding a candle and going deeper, there is a hole on the left, like a side room, follow it as it winds forward, at the end of the crevice there is water dripping down, but the bottom of the crevice is still dry, I don't know where the water goes.