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1·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》

2·For this reason, heavy-duty or truck engines have large and heavy flywheels, while racing engines or high performance engines have light flywheels.

由于这个因素，重型机车或卡车发动车都装配有大且重的飞轮，而赛车发动机或高性能发动机则装配有轻型飞轮。

3·EXPLORING the back roads on our own in a rented 4 x 4 truck, we found ourselves drag racing with ostriches — and discovering that despite their awkward gait, they usually win.

在一被租赁的4 x 4卡车上独自探索后面的路，我们发现自己在和驼鸟赛跑，并且发现尽管他们的步态笨拙，但是他们通常都能赢。