守备队

例句：

1. 1. The army has a strong guard to protect the capital.
   军队有一支强大的警卫队来保护首都。
2. 2.The police department has been working hard to improve their defense force.
   警察局一直在努力提高他们的防御力量。
3. 3. The soldiers were all in their guard positions when the enemy attacked.
   当敌人进攻时，士兵们都处于警戒位置。