《徐霞客游记·闽游日记后》
侧着身子前进，又有石片像先前那样阻塞在狭隘的洞口，高度则是先前石片的一倍。
侧身而进，又有石片如前阻其隘口，高更倍之。
I moved forward sideways, and there was another piece of slate blocking the narrow cave as before, but its height was twice that of the previous piece of slate.