guard staple

例句：

1. 1.He guards the gate with his life.
   他用生命守护着大门。
2. 2. The soldiers guarded the border against intruders.
   士兵们守卫着边境，防止入侵者。
3. 3. The policeman guarded the prison gate all night.
   警察整夜守卫监狱的大门。