卫戍

例句：

1. 1. The soldiers were ordered to guard the border against intruders.
   士兵们被命令守卫边境以防止入侵者。
2. 2. The police are tasked with the responsibility of defending the city from any potential threats.
   警方负责保卫城市，抵御任何潜在的威胁。
3. 3. The fortress was built to serve as a stronghold for the kingdom's defense.
   这座堡垒是为了作为王国防御的坚固基地而建造的。