A guard was posted outside the building. 建筑物外设了一名警卫。
verb [vi. 不及物动词]守卫,保卫;看守,监视;警惕,防范;保护,维护
If you guard someone, you watch them and keep them in a particular place to stop them from escaping. 看守 Gunmen guarded homes near the cemetery with shotguns. 枪手携带猎枪守卫着公墓附近的住宅。