On a typical day in a big city you may be filmed by hundreds of closed-circuittelevision (CCTV) cameras.
在一所大城市里的一天，你可能已被闭路电视（CCTV）摄像头记录了上千次。
2
IP cameras are most often used for IP surveillance, a digitized and networked version of closed-circuittelevision (CCTV).
IP摄像机通常用于IP监测、数字化和网络化的版本的闭路电视(CCTV)。
3
ACCORDING to a much-reported survey carried out in 2002, Britain then had 4.3m closed-circuittelevision (CCTV) cameras-one for every 14 people in the country.