ball rolling具体什么意思？

ball rolling 滚动球 ball rolling 英[bɔ:l ˈrəʊlɪŋ]美[bɔl ˈroʊlɪŋ] 释义 钢球轧制 双语例句 In order to improve single productivity, and got parameters of steel ball rolling, This paper has done pass design and experiments of two grooves rolling steel ball. 为提高球磨钢球的单机生产率，并获取钢球轧制的力能参数，进行了钢球双头轧制孔型设计及实验。