名词
中文翻译：变速齿轮
同义词：
['variator', 'variable gear', 'variable speed gear']
例句：
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1. Thecar's variable-drop pinion is responsible for its smooth acceleration and deceleration.
汽车的变速齿轮负责其平滑的加速和减速。
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2.The engineer used a variable-drop pinion to adjust the speed of the machine.
工程师使用变速齿轮来调整机器的速度。
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3.The variable-drop pinion system allows for precise control over the vehicle's speed.
变速齿轮系统允许对车辆速度进行精确控制。