The greatest amount of exhaust emissions are produced at idle and during low - speed operation.

排气中最大量的排放物是在怠速和低速运行时产生的.

辞典例句

The engine runs quietly at idle.

这发动机在空转(怠速)的时候非常安静.

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My aircraft , dubbed Goose Leader , burbled at idle.

我的飞行器, 我们戏称“领头雁”,悠闲自得地发出微弱的轰鸣声.

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