《徐霞客游记·粤西游日记十七》
此处山崖高削有数千尺，上边下覆下面深嵌，如垂在空中的云彩，绵亘连接到半空中。
其崖危削数千尺，上覆下嵌，若垂空之云，亘接天半。
The mountain cliff at this point is several thousand feet high, and the top and bottom are separated by a deep gap, as if it was a cloud hanging in the air, stretching and connecting to the sky.