名词
中文翻译：三速变速器
同义词：
['three-speed transmission', 'three-speed gearbox']
例句：
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1. The car hasa three-speed gear box that allows for easy shifting between different driving conditions.
这辆车有一个三速变速器，可以轻松地在各种驾驶条件下切换。
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2. The new model of the car has a three-speed gear box that is more efficient than its predecessors.
这款新车的三速变速器比前一代更高效。
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3. The mechanic replaced the old three-speed gear box with a new one to improve performance and reduce fuel consumption.
技师更换了旧的三速变速器，以提升性能并减少燃油消耗。