《徐霞客游记·滇游日记十二》
于是水再次环绕北崖流，道路再次环绕南崖走，洞里终于黑暗得无法看清什么，只听到水流潺潺的声音。
于是水再环北崖，路再环南崖，竟昏黑不可辨，但闻水声潺潺。
So the water flows around the north cliff again, while the road goes around the south cliff, and the cave is now so dark that nothing can be seen, and only the sound of the water flowing can be heard.