深潭

tā de shuāng yǎn shēn bù jiàn dǐ rú liǎng wān shēn tán

他的双眼深不见底，如两湾深潭。

His eyes were like bottomless pools.

shēn tán xì tǒng jù yǒu xiǎn zhù de shēng tài xué zuò yòng

深潭系统具有显著的生态学作用。

The pool system plays an important role in ecology.