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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This has the advantage of eliminating two wasteful steps: the conversion of the mechanical power of a windmill into electricity and its subsequent reconversion into mechanical power in a compressor.

这可消除两处能耗，即在风力的机械能转化为电能时，以及随后压缩机中的电能转化为机械能时。

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Fluid mechanics is a major course in the specialties of civil engineering, mechanical power and water conservancy.

流体力学是土木类、机械动力类及水利类专业的专业基础必修课。

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Rising pollution, global warming and shrinking fossil fuel reserves have focused world wide attention on how engines generate electrical and mechanical power.

CNN: Lab develops engine for the future

Previous airliners from Boeing, Airbus and other manufacturers have used a combination of electrical and mechanical power drawn from a plane's engines.

WSJ: Dreamliner-Like Batteries Raised Concerns

The lower density means dramatically less drag force acting on the spinning disk stack so that mechanical power into the motor is substantially reduced.

ENGADGET: HGST develops helium-filled, high-capacity hard drives: no, they won't float away