名词
中文翻译：内燃机
同义词：
['internal combustion engine', 'internal-combustion engine']
例句：
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1. The car's underdrive system is designed to improve fuel efficiency.
这款车的内燃机系统旨在提高燃油效率。
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2. The new model uses an underdrive gearbox for smoother acceleration.
新款车型采用了一种内燃机变速箱，以实现更平滑的加速。
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3.The underdrive gearbox was a significant advancement in the automotive industry.
内燃机变速箱在汽车工业中是一个重大的进步。