The approach would increase efficiency of engines, and reduce their pollution, by igniting more of the mixture.

这种方法将会则将提高发动机的效率，通过点燃更多的混合物会减少污染物的排放。

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The spark plug fires, igniting the compressed air-fuel mixture which produces a powerful expansion of the vapor.

火花塞点燃压缩的空气燃油混合气，燃烧使混合气迅速膨胀。

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Finally, we need some means of igniting the mixture in the top of the cylinder.

最后我们需用一些装置点燃汽缸顶部的混合气体。

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Nearly a century after they first appeared, they are still powered by igniting a mixture of fuel and air.

ECONOMIST: The millennium-bug muddle