对于任何给定的空气部分，更强大的扩展比允许更多的精力从热量转换为有用的机械能，这意味着发动机效率更高。
For any given portion of air, the greater expansion ratio allows more energy to be converted from heat to useful mechanical energy meaning the engine is more efficient.
发动机噪声是汽车噪声源的主要部分，它是由多种声源发出的噪声组合而成的，主要包括空气动力噪声和机械噪声和燃烧噪声。
Engine noise is the greatest part of the vehicle noise, it consists of many kinds of noise especially gas kinetic noise, mechanical noise and combustion noise.
接着启动机将这部分电能转化成机械能，通过驱动机构传到发动机曲轴飞轮上。
The starter motor then converts this energy into mechanical energy, which it transmits through the drive mechanism to the engine's fly wheel.
伞齿轮箱，发动机的一部分。被压气机以机械方式驱动，然后驱动附件齿轮箱。
ANGLE gearbox, a part of an engine, mechanically driven by the compressor, which drives the accessory gearbox.
伞齿轮箱，发动机的一部分。被压气机以机械方式驱动，然后驱动附件齿轮箱。
ANGLE gearbox, a part of an engine, mechanically driven by the compressor, which drives the accessory gearbox.
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