flail arm

例句：

1. 1. The soldier used his flail arm to beat the enemy soldiers into submission.
   士兵用他的挥舞的手臂将敌人士兵打服。
2. 2. During the battle, the general used his flail arm to rally his troops.
   在战斗中，将军用他的挥舞的手臂来鼓舞他的部队。
3. 3. The old man used his flail arm to chop wood for firewood.
   老人用他的挥舞的手臂砍柴生火。