挖战壕

例句：

1. 1.The soldiers dug deep trench to protect themselves from enemy attack.
   士兵们挖了深深的战壕来保护自己免受敌人的攻击。
2. 2.The engineers were busy repairing the damaged trench.
   工程师们忙于修复损坏的战壕。
3. 3. The trench was filled with water, making it difficult for the soldiers to move forward.
   战壕被水填满，使得士兵们难以前进。