名词
中文翻译：变速箱
同义词：
['transmission', 'gearbox', 'transmission system']
例句：
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1. The car's engine is connected to the transmission through a belt.
汽车的引擎通过皮带连接到变速器。
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2. The engineer replaced the worn-out transmission in the old truck.
工程师更换了旧卡车磨损的变速器。
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3. The new transmission has improved the car's performance significantly.
新的变速器显著提高了汽车的性能。