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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In the end, it's your choice as to whether your abnormalcy will be a source of shame or a source of power.

最后，我想说让你的不寻常成为羞耻的来源或者是力量的来源完全是你的选择。

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That's by design, because you don't want to end up in a situation where a problem at the plant cuts off its own power source.

这是故意的，因为你不希望出现因电站本身的问题导致了它自身电源被切断的情况。

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For added convenience, the SL30 is powered by easily available, AA alkaline batteries, assuring end-users that they can find a replaceable power source no matter where they may be.

ENGADGET: Samsung expands SL camera lineup: SL820, SL620, SL202 and SL30

When a disaster like Hurricane Sandy knocks out the lights, it's essential to have a source of off-grid power for communication devices like cell phones and radios -- to this end we showcased several portable charging technologies that generate renewable energy.

ENGADGET: Inhabitat's Week in Green: self-sustaining homes, wooden wind turbines and the world's first solar-powered nation