名词
中文翻译：Unknown
同义词：
['automatic gear shift', 'automatic transmission']
例句：
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1. The carhas an automatic gear shift for easy driving.
这辆车有自动变速，驾驶起来很轻松。
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2. The truck has a manual transmission that can be switched to automatic.
这辆卡车有一个手动变速器，可以切换到自动挡。
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3. The new car comes with an automatic transmission that saves time and effort.
这款新车配备了自动变速箱，既节省时间又省力。