名词
中文翻译：Unknown
同义词：
['speed', 'velocity', 'rate']
例句：
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1. The car accelerated to 60 miles per hour on the highway.
汽车在高速公路上以每小时60英里的速度加速。
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2. The project will increase the company's productivity by 20%.
该项目将使公司的生产力提高20%。
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3. The ship's speed was reduced to 20 knots due to bad weather.
由于恶劣天气，船只的速度被降低到20节。