guard;defend;janitor;sentinel;ward;

Staff withdrew from the main part of the prison but secured the perimeter.
工作人员从监狱的主要区域撤出,但外围仍派人守卫。
来源:《柯林斯高阶英汉双解学习词典》There's a building guarded by the local militia at the corner of the street.
街道拐角处有一幢由当地民兵团守卫的大楼.
来源:《简明英汉词典》The new security guard is a burglar — that'll put the cat among the pigeons.
新来的守卫是小偷——这下子可要鸡犬不宁了.
来源:《简明英汉词典》
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