名词
中文翻译：换档装置
同义词：
['step-up transmission', "step-up clutch例句：1. The car's engine has a step-up gear that allows for easy acceleration.（这辆车的引擎有一个换档装置，可以轻松加速。）"]
例句：
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1. The car's engine has a step-up gear that allows for easy acceleration.
这辆车的引擎有一个换档装置，可以轻松加速。
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2.The new model has a step-up gear system that improves fuel efficiency.
新款模型有一个换档系统，提高了燃油效率。
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3.The driver must step up to the next gear when accelerating from a stop.
当从停止状态加速时，驾驶员必须换到下一个档位。