guard sealcd method

例句：

1. 1. The guards patrol the perimeter of the castle every night.
   守卫们每晚巡逻城堡的外围。
2. 2. She is a skilled fighter and can guard her village against intruders.
   她是一名熟练的战士，能够保卫她的村庄免受入侵者的威胁。
3. 3.He was appointed as the new guard commander.
   他被任命担任新警卫指挥官。