动词短语
中文翻译：改变步速
同义词：
['speed up', 'slow down']
例句：
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1.The car's engine sputtered as it stepped up its speed.
汽车加速时发动机发出嘶嘶声。
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2.She decided to step up her training regimen.
她决定加强训练计划。
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3. The team changed their strategy to step up their performance.
团队改变了策略以提高表现。