单词：closed-circuit television
closed-circuit television的用法和样例：
例句
- 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。
- 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。
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