巡逻员

例句：

1. 1.The police are conducting a thorough investigation into the incident.
   警方正在对这起事件进行彻底的调查。
2. 2. The soldiers were ordered to patrol the borders at night.
   士兵们被命令在夜间巡逻边境。
3. 3. The security guard was assigned to patrol the area around the school gate.
   保安被分配到学校大门周围的区域进行巡逻。