名词
中文翻译：Unknown
同义词：
['shift', 'gear adjustment', 'gear shift']
例句：
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1. The car needs a gear change before we can go on.
在我们继续之前，这辆车需要换挡。
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2. The mechanic changed the gears to make the engine run better.
机械师换了齿轮使发动机运行得更好。
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3. When changing gears, be careful not to hit your foot with the clutch pedal.
换挡时小心不要踩到离合器踏板上。