动词短语
中文翻译：换挡
同义词：
['shift gears', 'change speed']
例句：
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1.When driving, it's important to change gears carefully to avoid accidents.
开车时，小心换挡以避免事故很重要。
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2. The car changed gears smoothly when I tried to accelerate.
当我试图加速时，汽车换挡很平滑。
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3. The old man changed gears as he walked along the road.
老人随着步伐换挡行走在马路上。