名词
中文翻译：齿轮更换
同义词：
['gear adjustment', 'gear replacement']
例句：
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1. The car needs a gear change to get up to speed.
这辆车需要换挡才能提速。
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2. The mechanic changed the gears on my old car.
机械师换了我旧车的车档。
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3. The driver had to change gears when the engine overheated.
当发动机过热时，司机不得不换档。