Water was the main source of mechanical power, and by the end of the seventeenth century, England alone is thought to have had some 20,000 working mills.

水是机械动力的主要来源，而到了17世纪末，人们认为仅英格兰就有2万个左右的工作磨坊。

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Some scholars argue that the concentration of water within the urban core of these sites provided a centralized source of political authority for Maya elites based largely on controlled water access.

一些学者认为，集中在这些地点的城市核心区的水资源为玛雅精英提供了一个集中的政治权力来源，而这些权力主要是基于对水资源的控制。

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More than 900 metres high, on the mountain's north face, lies an all-important source of pure water.

在这座山的北面，海拔900米以上的位置有一个非常重要的纯净水水源地。

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

VOA: special.2011.07.08

But these actions are polluting an important source of fresh water.

VOA: special.2010.11.10

In developing countries, the main source of water pollution is not stormwater,but waste water.

VOA: standard.2010.08.04

Ocean water desalination will not be a viable source of water for agriculture for decades.

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Agricultural cultivation consumes the largest share of water in the Arab region and is a primary source of water stress.

UNESCO: EDUCATION

Paget says Belu -- derived from the word blue and the Italian word for beautiful, "bella" -- takes a three-pronged approach to its clean water projects, by not only providing a clean water source for drinking but water for washing hands and education about the importance of hygiene.

CNN: Eco-friendly bottle for ethical water