marine public address system 船用广播设备
control of public address system 管制扬声器
haha public address system 公布系统
intrastation public address system 厂内播音系统
plant public address system 电厂广播系统
Public Address System On 音响运作 ; 音向运作
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以上来源于: WordNet
N-COUNT A public address system is a set of electrical equipment which allows someone's voice, or music, to be heard throughout a large building or area. The abbreviation is also used. 播音装置; 可缩写为PA
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