The truck came to rest against a tree, its engine racing.

卡车靠着一棵树停了下来，引擎空转着。

《牛津词典》

The driver waited for the green light, his engine racing.

那司机等候绿灯放行，让发动机空转著。

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Combining a rocket, a jet and a racing-car engine into one vehicle is engineering of an extreme sort, but record-breaking often demands that new problems be solved.

将火箭发动机、喷气式发动机和赛车发动机整合到一部车里，是一种极不寻常的设计，但是破纪录经常需要解决很多新问题。

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The race car meets all of the Formula Three racing requirements except for its biodiesel engine.

VOA: special.2009.11.03

The engine will be based on the Porsche RS Spyder racing engine that demonstrated its impressive performance and efficiency through multiple Michelin Green X Challenge victories in the American Le Mans Series, the Le Mans Series and the 24 Hours of Le Mans.

ENGADGET: Porsche opens 918 Spyder plug-in supercar pre-orders, $845,000 gets you a ticket to ride

Mr. Collier's younger brother Andrew is a machinist in the engine department at auto racing's Hendrick Motorsports.

WSJ: A Young Officer Shot Dead and Another Critically Hurt

You really did slip past those kids playing touch football, or that moose, or that dog racing the engine and losing.

NPR: Hobo, Interrupted, Still 'Dreams of Trains'