ball grinder

例句：

1. 1. The ball grinder is used to grind small materials into a fine powder.
   球磨机用于将小材料研磨成细粉。
2. 2. The ball grinder is an essential tool in the production process.
   球磨机是生产过程中不可或缺的工具。
3. 3. The ball grinder was used to crush the ore before it could be processed further.
   球磨机被用来粉碎矿石，以便进一步加工。