Perched on top of the fencing is a network of 900 surveillance cameras to detect intrusions.

围栏顶部是一个由900个监控摄像头组成的网络，用来探测入侵。

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Analyses are being performed by two WHO influenza collaborating centres as part of the global influenza surveillance network.

作为全球流感监测网络成员的两个世卫组织流感合作中心正在开展分析工作。

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The study links a related international network of health and demographic surveillance: the Demographic evaluation of populations and their health (INDEPTH).

该研究与一个相关的国际健康与人口监测网络（人群及其健康的人口学评价（INDEPTH））建立联系。

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The United States Space Surveillance Network is closely studying the collision involving the Russian satellite.

VOA: special.2009.04.01

Called Emerald, it is designed for network surveillance and intrusion detection.

CNN: Security experts say hackers have the edge

In the United States, Chicago has the most comprehensive network of surveillance cameras, estimated at more than 10, 000.

WSJ: Bombing probe highlights expansion of surveillance

This conclusion is based on evidence provided by forensic experts and CCTV footage obtained from a network of surveillance cameras installed by the Karachi district government in sensitive areas of the city.

BBC: Karachi bomb was 'caused by IED'