名词
中文翻译：变速箱齿轮组
同义词：
['countershaft', "gear cluster例句：1. The engine's countershaft gear cluster is designed to provide smooth operation.（发动机的变速箱齿轮组设计用来提供平稳的操作。）"]
例句：
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1. The engine's countershaft gear cluster is designed to provide smooth operation.
发动机的变速箱齿轮组设计用来提供平稳的操作。
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2. The technician replaced the countershaft gear cluster in the transmission.
技术人员更换了变速器中的变速箱齿轮组。
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3.The new design of the countershaft gear cluster has improved efficiency by 20%.
新设计的变速箱齿轮组提高了效率，提高了20%。