The structure is surrounded by water.

VOA: special.2009.12.13

I mean, they're surrounded by water everywhere you look.

我是意思是,那儿四面环水

耶鲁公开课 - 古希腊历史简介课程节选

The opposite leaflet does the other thing, the water soluble part points down and the fat points up, so now you have thin region of fat which is surrounded on both sides by water.

相反的部位则有不同的情况,水溶性部分向下,而脂肪向上,所以现在就得到了,两侧均被水包围的薄层脂肪区域

耶鲁公开课 - 生物医学工程探索课程节选

The light house was on a small rocky island surrounded by deep water.

VOA: special.2010.05.08