patrolling例句

Police were periodically patrolling the area.
警察定时在这一地区巡逻。

Police are patrolling the major approach roads to the stadium.
警察正在通往运动场的主要道路上巡逻.

I saw women patrolling the streets with rifles on their backs.
我看到妇女背着枪在街上巡逻.

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