单词	closed-circuit television
释义	closed-circuit television /ˌkləʊzdˌsəːkɪt ˈtɛlɪvɪʒ(ə)n / (abbreviation CCTV) noun [mass noun] A television system in which video signals are transmitted from one or more cameras by cable to a set of monitors, used especially for security purposes.All three were recorded on video tape by closed-circuit television systems.... The three-way system is linked to closed-circuit television camera operators and the police to keep tabs on offenders' movements. She said the crocodile was being monitored by closed-circuit television cameras and that footage would be displayed on television monitors so visitors to the farm could see what it was doing.
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