Tra từ public address system - Từ điển Oxford Advanced Learner 8th

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Từ điển Oxford Advanced Learner 8th

public address system ˌpublic adˈdress system [public address system] BrE NAmE noun (abbr.PA system) an electronic system that uses ↑microphones and ↑loudspeakers to make music, voices, etc. louder so that they can be heard by everyone in a particular place or building