When our sources of fresh water get polluted, we can no longer use this water.

当我们的淡水来源被污染，我们就不能再使用这些水。

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Never use water from the sources listed below for drinking.

千万不能用以下列出的来源中的水来饮用。

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While water is generally agreed to be one of the most potent sources of conflict in this coming century, we still use it very badly.

虽然人们普遍认为水是造成本世纪冲突的最强大原因之一，我们仍然在非常不恰当地利用着水。

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But in the 1940s, the Soviet Union began to use those rivers as irrigation sources, diverting water away from the sea.

NPR: Book Takes Wide-Angle View of a Changing Planet

Globally, mountain areas are vital sources of water for agricultural, industrial, and domestic use.

UNESCO: Ecological Sciences and Research

With few sources of fresh water in the region, the country has relied on desalinating seawater for domestic use -- a technology that has been essential to the country's growth, according to advocates.

CNN: Man-made desert lake: Ecological paradise or disaster?