名词
中文翻译：Unknown
同义词：
['below-normal speed', 'slow-down', 'underperform']
例句：
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1. The car wasunderspeeding when it hit the guardrail.
汽车撞上护栏时速度过快。
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2. The driver was fined for being underspeeding in a residential area.
司机因在居民区超速被罚款。
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3.The team's performance underspeeded compared to last season.
与上赛季相比，球队的表现有所下滑。