The Ogallala aquifer is a major source of drinking and irrigation water for America's central plains.

VOA: special.2011.07.08

Or sometimes the Romans liked to take a big theater and fill the central part of the theater, the cavea, with water and then stage naval battles and that kind of thing.

有时候罗马人也喜欢利用大剧院,在大剧院的中心和兽笼，注满水，上演大海战之类的。

耶鲁公开课 - 新约课程节选