This is the 5013th most frequent Chinese word.
閉路電視
Closed-circuit television (CCTV).
Here, '閉路電視' refers to CCTV (closed-circuit television), indicating a surveillance system used for monitoring and security purposes.
我家附近新安裝了一個閉路電視系統。
A new CCTV system was installed near my house.
In this sentence, '閉路電視' serves as the source of recorded video footage used during an investigation.
警察調閱了閉路電視的錄像來調查案件。
The police reviewed CCTV footage to investigate the case.
This usage of '閉路電視' implies an active monitoring system implemented for managing access and safety.