由于高昂的燃油费和税收刺激，汽车和货车的行驶公里数连续四年下降，同时燃料的使用效率也在提高，最显著的原因是新车使用了更好的引擎。

Thanks to pricey fuel and tax incentives, car and van mileage has fallen for four consecutive years and fuel efficiency has increased, notably because new cars have better engines.

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人体不是简单地象一辆旧汽车，有着很多公里数。

The human body doesn't simply wear out like an old car with too many miles on it.

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