[电] 扬声系统
1. 广播系统：loudness 响度 | loudspeaker system 广播系统 | loudspeaker 扩音器
1. For the first time, no Christmas carols were broadcast over a loudspeaker system.
noun
1. electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance
Synonym: loudspeaker speaker speaker unit speaker system