碰撞数

碰的英语翻译：

bump; meet; run into; touch

撞的英语翻译：

bump; bump into; collide; meet by chance; ram; strike

数的英语翻译：

a few; count; enumerate; fate; frequently; list; number; numeral; numeric
reckon; repeatedly; serveral
【计】 crossing number; N
【医】 number
【经】 number