flail knife

例句：

1. 1.The farmer used a flail knife to clear the weeds from the field.
   农民用铁锹刀把杂草从田地里清除。
2. 2. He was digging with a flail knife when he heard a noise in the bushes.
   他正在用铁锹刀挖土时，听到了灌木丛里的声音。
3. 3. The flail knife was a useful tool for breaking up rocks and soil.
   铁锹刀是打破岩石和土壤的一种有用的工具。