动词短语
中文翻译：巡逻
同义词：
['on duty', 'on patrol duty']
例句：
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1. The police officers were on patrol whenthey spotted the thief.
警察在巡逻时发现了小偷。
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2. The soldiers were on patrolin the deserted village.
士兵们在荒凉的村庄里巡逻。
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3. The firefighterswere on patrol to check for any newfires.
消防员在巡逻检查是否有新的火灾发生。