closed-circuit

• 指信号仅在有限数量的接收者之间传输的系统，通常用于电子或电视系统，与公开广播相对。也可泛指封闭的、只限于特定范围内的。

Describes a system, typically electronic or televisual, in which the signal is transmitted only to a limited number of receivers, as opposed to being broadcast publicly.

1. Closed electrical circuitB2formaltechnical

   Relating to or consisting of a complete electrical circuit through which current can flow.

   闭合电路

   • The technician checked the closed-circuit wiring for any faults.
   • A closed-circuit system ensures continuous power flow.
   • The device operates only when the closed-circuit connection is intact.

   同义词closedcompletecontinuousunbroken

2. Closed-circuit television (CCTV)B1formaltechnical

   Relating to a television system in which signals are transmitted to a limited set of monitors, typically for surveillance.

   闭路电视

   • The building is monitored by a closed-circuit camera system.
   • Closed-circuit television helps prevent theft in stores.
   • They installed closed-circuit cameras in the parking lot for security.