名词
中文翻译：回退齿轮传动系统
同义词：
['reverting gear train', 'reverting transmission']
例句：
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1. The engineerhad to revert to a manual gear train for the emergency repair.
工程师不得不手动操作齿轮传动系统进行紧急修理。
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2.The old car's gear train was worn out, so we replaced it with a new one.
旧车的齿轮传动系统磨损严重，所以我们更换了一个新的。
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3.The engineer had to revert to a manual gear train for the emergency repair.
工程师不得不手动操作齿轮传动系统进行紧急修理。