名词
中文翻译：警察
同义词：
['police', 'policeman', 'special police']
例句：
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1. The Cheka were sent to investigate the suspicious activities in the city.
警察被派去调查城市中的可疑活动。
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2. The Cheka had to be very careful when dealing with the suspects.
当处理嫌疑人时，警察必须非常小心。
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3. The Cheka were responsible for maintaining public order during the protests.
在抗议期间，警察负责维护公共秩序。