The surveillance network tracks objects approximately 10 centimeters in diameter and larger.

该监测网的监测对象是直径10厘米以上的太空垃圾。

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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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"We haven't found evidence of infected pigs," said Ian Lipkin, a Columbia University epidemiologist and member of the World Health Organization's surveillance network.

“我们还没有发现受感染的猪，”哥伦比亚大学流行病学家和世界卫生组织监测网络成员伊恩·利普金说。

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

VOA: special.2009.04.01

Nonetheless, a London-based organization called Big Brother Watch has been campaigning to cut back on the surveillance network.

WSJ: Bombing probe highlights expansion of surveillance

The upside of this expanding surveillance network is clear a greater potential for law enforcement to solve crimes and, in some instances, to prevent them.

WSJ: Bombing probe highlights expansion of surveillance

Space debris is tracked by the United States Space Surveillance Network that uses radar that can detect an object the size of a pea at 400 miles.

BBC: By BBC News Online Science Editor Dr David Whitehouse