名词短语
中文翻译：Unknown
同义词：
['average number of collisions', 'average number of crashes', 'average numberof impacts']
例句：
-
1.The mean number of collisions between carsand pedestrians has increased significantly in recentyears.
近年来，汽车与行人之间的碰撞次数显著增加。
-
2. The study found that themean number of crashes per year had decreasedby 20%.
研究发现，每年的平均碰撞次数下降了20%。
-
3. Theengineer calculated the mean number of impactsto ensure the safety of the new design.
工程师计算了平均撞击次数，以确保新设计的安全性。