The crankshaft serves to change the reciprocating power into rotary power.

曲轴的作用是把往返力变为旋转动力。

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A rotary engine attached to the steam engine enabled shafts to be turned and machines to be driven, resulting in mills using steam power to spin and weave cotton.

连接在蒸汽机上的旋转式发动机使轴承转动，机器得以驱动，从而使得利用蒸汽动力纺线和织布的工厂出现。

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The crankshaft, regarded as the "backbone" of the engine, serves to change the reciprocating motion of the piston into rotary motion and handles the entire power output.

曲轴，也叫做发动机的“脊柱”，其作用是将活塞的上下往复运动转换成为旋转运动，并且控制着整个的功率输出。

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Instead, the company's selling SteornLab testing equipment to other organizations working on magic fairy-power rotary and magnetic systems, and it's also got plans to sell something called "ZeroF passive magnetic bearings" later this year -- we'd assume ZeroF means "zero friction, " which is nicely impossible and totally in line with basically everything Steorn stands for.

ENGADGET: Steorn returns, promises to open Orbo specs, give you a pony

Comparing backup and primary power solutions is like comparing rotary phones and smart phones.

FORBES: Backup Generators Are the Bad and Ugly of Decentralized Energy

The room -- named after Grand Central's 42nd Street location -- houses a series of rotary converters, which, back in the 1930s, provided the power that electrified the terminal's 63 tracks.

CNN: Memorable moments in Grand Central's 100 years