(especially of soldiers or the police) to go around an area or a building to see if there is any trouble or danger

The whole town is patrolled by police because of the possibility of riots. 为防止发生骚乱整个城镇都有警察巡逻。

A security guard with a dog patrols the building site at night. 夜间一名保安带着一条狗在建筑工地巡逻。

Coastguards found a deserted boat while patrolling (along) the coast. 海岸警卫队在岸边巡逻时发现了一条被遗弃的船。

the act of checking that there is no trouble or danger in a building or area

a highway patrol 公路巡查

Three reconnaissance aircraft are permanently on patrol. 3架侦察机在不停巡逻。

a small group of soldiers or military ships, aircraft, or vehicles, especially one that patrols an area

Our forward patrol has/have spotted the enemy. 我们的先遣巡逻队发现了敌人。