1、There's a closed-circuit television camera in the reception area.
接待處有一臺(tái)閉路電視攝像機(jī)。

2、Researchers observed the children via closed-circuit television and recorded their activities.
研究者通過(guò)閉路電視觀察孩子們的行為。

3、On a typical day in a big city you may be filmed by hundreds of closed-circuit television cameras.
在一所大城市里的一天，你可能已被閉路電視（CCTV）攝像頭記錄了上千次。

closed-circuit television翻譯