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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Valve actuation utilizes a mechanical power device, an actuator, to operate a valve.

阀门执行机构是一种采用机械力的设备，一台执行机构操作一个阀门。

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The result of the invention of the steam engine was that human power was replaced by mechanical power.

蒸汽机发明的结果是机械力代替了人力。

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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