《徐霞客游记·粤西游日记七》
于是脱去衣服赤裸着身体，如蛇和尺镬一样一伸一曲地上爬，终于出到上层平架着的楼阁上，坐在洞口飞石架成的桥上，高声呼唤静闻，很久以后才到来，也用先前的方法教给他像猿猴一样登上来，这才一同下去。
于是脱衣赤体，蛇伸蠖曲，遂出上层，踞洞口飞石驾梁之上，高呼静闻，久而后至，亦以前法教猱而升，乃共下焉。
So I took off my clothes and crawled up like a snake or a millipede, finally reaching the upper-level, flat-topped pavilion, sitting on the bridge made of stones propped up at the entrance of the cave, and calling out to Jingwen in a loud voice. He arrived after a long time and also used the same method to teach him to climb up like a monkey before we went down together.