蓄水池

The cistern is empty but soon fills again.

里现在没,但不久就会储满的。

The river runs through several underground caves which store the water for the city's use.

这条河流经几处贮存城市用的地下。

The tank gradually emptied.

的渐渐流空了。

It serves, they say, as a reservoir of beneficial microbes which can recolonize the gut after it's emptied by diseases such as cholera or dysentery.

他们说它像一个有菌的那样工作着，当被像霍乱和痢疾之类的疾病耗尽之后能够再重新迁移到肠道中去。