Shān / dòng / shēn / chù / yǒu / yì / tán / zhǐ / shuǐ / shuǐ / miàn / píng / jìng / de / méi / yǒu / yì / sī / bō / wén

山洞深处有一潭止水，水面平静得没有一丝波纹。

There is a pool of still water deep inside the cave, with not a ripple on its surface.