| 释义 |
public address systemBrE /ˌpʌblɪk əˈdres sɪstəm/ NAmE /ˌpʌblɪk əˈdres sɪstəm/ noun (abbreviation PA system , PA ) 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 广播系统 |