Exhaust emission of vehicle engines is one of the primary air pollution sources.

车用内燃机的废气排放是大气污染的主要污染源之一。

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The power performance, fuel economy, and exhaust emission of the vehicle engines are improved considerably through the electronic control.

电子控制使汽车发动机的动力性能、经济性和排放污染得到了很大的改善。

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Charging for road use has the potential to tackle tough transport challenges, such as growing traffic volumes and the increasing fuel efficiency of vehicle engines.

道路使用收费系统有望解决严重的交通问题，诸如不断增加的交通流量以及日渐提高的汽车引擎燃油效率。

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They were interested in what happened to benzene, a well-known carcinogen, which is emitted by vehicle engines when petrol is not completely burnt.

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Plus, he said, it has already developed the vehicle platforms, engines and transmissions to make the product shift possible.

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Cummins, which employs 1, 200 people in Daventry, said worldwide demand for its heavy duty vehicle and marine engines had fallen and costs had to be cut.

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