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.
汽车以每小时60英里的速度加速。
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2. The project will reach its target velocity within six months.
该项目将在六个月内达到其目标速度。
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3. The ship's speed is determined by the wind and current conditions.
船速取决于风和水流的条件。