名词
中文翻译：Unknown
同义词：
['closed-loop', 'closed-circuit television (CCTV)', 'closed-access system']
例句：
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1.The police used closed-circuit cameras to monitor the crime scene.
警方使用闭路摄像头来监控犯罪现场。
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2.The new closed-circuit system will improve the security of our building.
新的闭路系统将提高我们大楼的安全性。
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3. The closed-circuit camera was installed in the entrance to prevent unauthorized access.
在入口处安装了闭路摄像头以防止未经授权的进入。