壕

例句：

1. 1. The soldiers dug a deep trench to protect their position.
   士兵们挖了一条深壕沟来保护自己的位置。
2. 2. The enemy launched an attack from the moat.
   敌人从护城河发起了攻击。
3. 3. The engineers were working on repairing the moat.
   工程师们正在修理护城河。