a spent bullet

例句：

1. 1. The soldierwas shot in the leg and had tobe bandaged up with a spent bullet.
   士兵腿部中弹，不得不用用过的子弹包扎伤口。
2. 2. The old man usedto shoot at birds with his spent bullets.
   老人过去常常用他的空弹头射击鸟儿。
3. 3. After the battle, thesoldiers retrieved their spent bullets andprepared for the next attack.
   战斗结束后，士兵们回收了他们的空弹头，准备迎接下一次攻击。