名词
中文翻译：警卫单位
同义词：
['guard post', 'guard detail', 'security unit']
例句：
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1.The police are conducting a thorough investigation into the incident.
警方正在对这起事件进行彻底的调查。
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2. The soldiers were ordered to stand guard at the border.
士兵们被命令在边境站岗。
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3.The security guard was alerted to the suspicious activity in the building.
安全警卫被告知大楼内出现了可疑活动。