名词
中文翻译：齿轮
同义词：
['cog', 'gearbox', "transmission例句：1. The car's engine needs to be tuned up regularlyto maintain optimal performance.（汽车的发动机需要定期调校以保持最佳性能。）"]
例句：
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1. The car's engine needs to be tuned up regularlyto maintain optimal performance.
汽车的发动机需要定期调校以保持最佳性能。
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2. Theold clock needed a new gear to keepit running smoothly.
旧时钟需要更换新的齿轮才能顺畅运行。
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3. The train'sgears are designed to handle heavy loadswithout breaking down.
火车的齿轮设计用来承受重载而不断裂。