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。

youdao

I'm gonna turn off the surveillance cameras. Ready?

我要关掉摄像头了，准备好了吗？

youdao

Because the surveillance cameras are on a 20-second rotating loop Gaines does not see Tony and Jamey.

由于安全摄像头处于20秒钟的旋转循环期间，盖恩斯并没有在屏幕上看到托尼抓走杰米。

youdao

And police have purchased additional crowd control equipment, including six helicopters, and 300 mobile surveillance cameras.

VOA: standard.2009.06.12

The move came after detainees covered surveillance cameras and windows, a US Army spokesman said.

BBC: Clashes at Guantanamo over hunger strike prisoners

After the Boston Marathon bombings, Mayor Rahm Emanuel was quick to tout Chicago's surveillance cameras.

WSJ: Bombing probe highlights expansion of surveillance

Airports should be mandated to have surveillance cameras throughout their facilities, if they don't already.

FORBES: THE AUSTRIAN SOLUTION