patrolmen（复数）：巡逻的警察；巡警（常指在街区巡逻、维持治安的警员）。单数为 patrolman。
/ptrolmn/
The patrolmen walked up and down the street at night.
巡警夜里在街上来回巡逻。
After the alarm went off, two patrolmen arrived quickly and asked everyone to stay calm while they checked the building.
警报响起后，两名巡警很快赶到，并让大家保持冷静，同时检查大楼情况。
patrolman 由 patrol（巡逻）+ -man（从事某职业的人）构成。patrol 源自法语 patrouille（巡逻队/巡逻），进一步可追溯到与“脚步、走动”相关的词根意象；整体含义就是“负责巡逻的人”。
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