手推磨

例句：

1. 1. This hand-powered grinder is very efficient for grinding coffee beans.
   这个手摇磨非常高效，用于研磨咖啡豆。
2. 2. The old farmer used to use a hand-powered mill to grind his wheat.
   那位老农民过去常使用手摇磨来磨他的小麦。
3. 3. In ancient times, hand-powered mills were the only way to grind grains.
   在古代，手摇磨是碾磨谷物的唯一方式。