柴油汽车也比汽油汽车拥有更好的燃料燃烧效率。
Diesel cars also have better fuel economy than petrol-driven ones.
另外，火花塞也有可能成为堵塞或脏因燃料燃烧效率低。
In addition, spark plugs may also become plugged or dirty due to inefficient fuel burning.
火花塞只点燃火花隙附近的燃料混合物，这就降低了燃烧效率，并且随着使用年限增加火花塞中的金属慢慢被侵蚀。
Spark plugs only ignite the fuel mixture near the spark gap, reducing the combustion efficiency, and the metal that makes them up is slowly eroded as they age.
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