名词中文翻译1
中文翻译：Unknown
同义词：
['average speed', 'standard speed', 'average velocity']
例句：
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1.The car is traveling at a normal running speed of 60 miles per hour.
汽车以每小时60英里的正常行驶速度行驶。
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2. The police officer slowed down to maintain the normal running speed of traffic.
警察减速，以保持交通的正常行驶速度。
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3. The train was moving at a normal running speed when it hit the bridge.
火车在撞击桥梁时以正常的行驶速度移动。