名词
中文翻译：可变速驱动装置
同义词：
['variable speed gear', 'variable transmission']
例句：
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1. The car has a live-roller gear system that allows for easy acceleration and quick braking.
这辆车配备了一个可变速驱动系统，可以轻松加速和快速制动。
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2. The new model uses a more advanced live-roller gear design to improve fuel efficiency.
新款模型采用了更先进的可变速驱动设计，以提高燃油效率。
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3. The engineers worked tirelessly to develop a live-roller gear system that could handlethe heavy loads of the construction site.
工程师们不懈努力，开发了一种可以处理建筑工地重载的可变速驱动系统。