free-swinging flail

例句：

1. 1. The farmer used a free-swinging flail to clear the field of weeds.
   农民使用自由摆动的镰刀来清除田间的杂草。
2. 2. During the harvest season, farmers often use free-swinging flails to cut down trees.
   在收获季节，农民经常使用自由摆动的镰刀来砍伐树木。
3. 3.The old man was using his free-swinging flail to plow the fields in the countryside.
   老汉正在用他的自由摆动的镰刀在乡下耕地。