tumbling mill

例句：

1. 1. The tumbling mill was the onlysource of water for the village.
   这个摇动的磨坊是村庄唯一的水源。
2. 2.The old millstone is still in usetoday.
   旧的磨石仍然在使用中。
3. 3.The millstones were used to grindgrain into flour.
   磨石被用来把谷物磨成面粉。