converter mill

例句：

1. 1. The converter mill is used to grind grains into flour.
   转换器磨坊用于将谷物磨成面粉。
2. 2.The converter mill is a crucial part of the food processing industry.
   转换器磨坊是食品加工行业的关键部分。
3. 3. The converter mill was invented to save time and labor in the early days of agriculture.
   转换器磨坊是在农业早期发明的，以节省时间和劳动力。