to thresh

例句：

1. 1. The farmer has to thresh the wheat before it dries out.
   农民必须在小麦变干之前收割它。
2. 2.The farmers are busy threshing the grains for the winter.
   农民们正忙着为冬天收割谷物。
3. 3.The threshing machine is a big help in harvesting the crops.
   脱粒机在收获作物时大有帮助。