closed circuit television

• n. 闭路电视

例句

用作名词 (n.)

1. There is a closed circuit television and hi-fi system in the room.
   房内有闭路电视和高保真音响。
2. In education,closed-circuit television makes it easy for a whole class to see everything a teacher demonstrates.
   在教育方面，闭路电视能使全班同学易于看清教师所演示的一切。