名词
中文翻译：换挡单元同义词
同义词：
['shift gear', 'shift lever', 'shifter']
例句：
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1. The car's shift unitis located under the dashboard.
汽车的换挡单元位于仪表盘下方。
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2. Theengineer had to shift the unit to ahigher gear to get the engine running smoothly.
工程师不得不将换挡单元调至更高档位，以便发动机顺畅运行。
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3.The shift unit was designed to make shiftinggears easier for drivers.
换挡单元的设计是为了使换挡更容易，让驾驶员更轻松。