1. U 巡逻；巡查　action of patrolling
2. C 巡逻队　group of people that patrols an area

　patrol　作“巡逻队”解时为集合名词，以其单数形式作主语时，谓语动词可用单数形式，也可用复数形式。

　change a ～　换班巡逻
　elude a ～　躲开巡逻队
　intensify a ～　加强巡逻
　military ～　军事巡逻
　regular ～　定时巡逻
　motorway ～　公路巡逻
　shore ～　岸上巡逻队
　during ～　巡逻期间
　on ～　巡逻中

　They made hourly patrols of the area.　他们在该地带每小时巡逻一次。
　A patrol was sent on reconnaissance.　一支巡逻队被派去执行侦察任务。
　The patrol have reported that all is quiet.　巡逻队报告一切平安无事。

 ♣ on patrol
　在巡逻中　patrolling a particular area
　They attacked two soldiers on patrol.　他们袭击了两名正在巡逻的士兵。

　vt. & vi.巡逻 go at regular time round (an area, building) to see that there is no trouble, that no one is trying to get in or out illegally, etc.

　～ camp　在营地巡逻
　～ the school ground　在校园场地巡逻
　～ the street　在街上巡逻
　～ carefully〔cautiously〕　谨慎地巡逻
　～ ceaselessly　不间断地巡逻
　～ hourly　每小时巡逻一次
　～ perpetually　永远地巡逻
　～ systematically　有序地巡逻
　～ vigilantly　警惕地巡逻

　We have been patrolling for days but have seen nothing.　我们巡查多日却什么也没发现。
　Police patrol at night guarding the town.　警察夜间巡逻保护这个城镇。

　Policemen patrol the streets.　警察在街上巡逻。
　Watchmen patrol the school grounds.　守夜人在校园里巡逻。
　Bands of youth patrol the street on Saturday.　星期六晚上成群的青年逛马路。
　The camp was carefully patrolled.　营地被严加巡逻。
　The grounds of the presidential palace are patrolled by soldiers with guard dogs.　总统府的庭院有士兵带着警犬巡逻。

　［词源］法语patrouiller