Water in the sand between the two pots evaporates through the surface of the larger pot, where drier outside air is moving.

VOA: special.2009.02.09

And I was out there and the only place you could really get water, except for a few drinking fountains, were from the Evian booths and it talks on-- sand o three fifty for a bottle of water, which is pretty typical of these places, but what was interesting was the fact that this is shipped in from France.

我也去看了,除了几个饮水机之外,唯一可以喝到水的地方,就是依云矿泉水的摊位,而它的一瓶水要3.5美元,这种地方通常都是这个价,但有意思的是,这是由法国进口的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Hundreds of the islands are only pieces of sand that extend a few feet out of the water.

VOA: special.2010.03.22

Engineers have found that wetlands, grassy fields and soil or sand filters can take in stormwater with different levels of pollution and release water with a relatively constant cleanliness.

VOA: standard.2010.08.04