这个水库为周边地区提供了充足的灌溉用水。

The ___reservoir supplies ample irrigation water for the surrounding area.

这个天然水库为整个城市提供饮用水。

The natural ___reservoir provides drinking water for the entire city.

这位老人是他家族智慧的宝库。

The old man is a ___reservoir of wisdom for his family.