名词
中文翻译：加速齿轮
同义词：
['speed-up mechanism', "gearbox例句：1. The car's speed-up gear is designed to increase the vehicle's acceleration.（汽车的加速档设计用来提高车辆的加速度。）"]
例句：
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1. The car's speed-up gear is designed to increase the vehicle's acceleration.
汽车的加速档设计用来提高车辆的加速度。
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2. The engineer used a special tool to speed up the gear.
工程师使用一种特殊的工具来加快齿轮的速度。
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3.The new design of the gearbox has significantly improved the car's performance.
新型的齿轮箱设计显著提高了汽车的性能。