气门关闭，活塞在气缸内上移，压缩空气燃烧混合物。
The intake valve closes and the piston moves up in the cylinder, compressing the fuel mixture.
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.
内燃机所用的燃料是汽油和空气的混合物。汽油夹着空气，燃烧后产生驱车动力。
It USES a mixture of petrol and air, and this mixture explodes and burns, to produce the energy which propels the car.
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