名词
中文翻译：齿轮
同义词：
['gearbox', 'gearbox', 'transmission']
例句：
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1. The car's X-gear is designed to make driving smoother.
汽车的X-档设计用来使驾驶更平稳。
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2. The old man used to work the X-gear on his tractor.
这位老人以前经常在拖拉机上操作X-档。
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3. The X-gear is a crucial part of the engine's operation.
X-档是发动机运行的关键部分。