Steel grinding ball

• 钢球

Steel grinding ball的用法和样例：

例句

1. This sport involves two contestants bowling heavy steel balls down the road.
   这项运动是让两名竞争者在街道上滚动沉重的钢球。
2. The vibration performance of cycloid ball planetary reducer was analyzed.
   分析摆线钢球行星传动减速器的振动特性。