名词
中文翻译：Unknown
同义词：
['cop', 'officer', 'constable', 'law enforcement official']
例句：
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1. He was a policeman for many years.
他当过很多年的警察。
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2. The policeman asked him to leave the area immediately.
警察让他立刻离开那个区域。
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3. The policeman had just arrested the suspect.
警察刚逮捕了那个嫌疑人。