名词
中文翻译：监视
同义词：
['monitor', 'watch', 'observe', 'spy']
例句：
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1.The police are conducting a surveillance operation in the area.
警方正在该地区进行监控行动。
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2.She was under surveillance by the authorities for her activities.
她因她的活动被当局监视。
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3.Surveillance technology has improved significantly in recent years.
近年来，监控技术有了显著的改进。