若以目前商用客机而言，答案是“涡轮扇引擎”，它是近数十年来最新的演化成果。

For virtually all commercial airliners today, the answer is "turbofan engines," the latest in a decades-long evolution.

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一辆迈凯轮F1赛车启动了自己的引擎，一扇门被打开，赛车开上了狭窄的T型台。

McLaren Formula One car started its engine, a door opened, and the car roared down the narrow catwalk.

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