名词
中文翻译：可变速齿轮
同义词：
['variable speed gear', 'variable speed reducer', 'variable speed transmission']
例句：
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1. The carhas a sophisticated articulated reduction gear system that allows it to accelerate quickly and smoothly.
这辆车拥有一个复杂的可变速齿轮系统，它能够快速而平稳地加速。
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2. The engineers designed the gear to be easily adjustable for different applications.
工程师们设计了这种齿轮，以便在不同的应用中进行轻松调整。
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3. The articulated reduction gear is crucial for the smooth operation of the machinery.
这种可变速齿轮对于机械设备的平稳运行至关重要。