名词
中文翻译：Unknown
同义词：
['Automatic transmission', 'Automobile gearbox']
例句：
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1. The automatic gear allows the car to change gears effortlessly.
自动变速使汽车能够轻松换挡。
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2. The engineer replaced the old automatic gear with a new one.
工程师用一个新的替换了旧的自动变速箱。
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3. The automatic gear is designed to simplify the driving process.
自动变速箱的设计是为了简化驾驶过程。