Tra từ closed-circuit television - Từ điển Oxford Advanced Learner 8th

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Từ điển Oxford Advanced Learner 8th

closed-circuit television ˌclosed-ˌcircuit ˈtelevision [closed-circuit television] BrE NAmE noun uncountable (abbr.CCTV) a television system that works within a limited area, for example a public building, to protect it from crime