In the early days of cars, you actually had to crank the engine with a little handle. Now the cranking motor or starter is just powerful enough to start the engine turning.

以前的汽车需使摇柄才能使发动机启动，现在启动机或点火机已足以使发动机启动了。

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At 80 mph, the engine is turning about 1, 800 rpm (redline is 4, 500 rpm).

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Then they realized people would have to fly without the reassuring blur of propellers turning and dropped the jet engine like a hot potato.

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Gene Kan proved its usefulness by turning Gnutella into a fast search engine.

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