mole ball

例句：

1. 1.The soldiers were trained to use the mole ball for defense.
   士兵们被训练用来使用地雷球进行防御。
2. 2. The mole ball was a crucial component in the war effort.
   地雷球是战争努力中至关重要的组成部分。
3. 3. The mole ball was used to protect the border from intruders.
   地雷球被用来保护边境免受入侵者的威胁。