loudspeaker horn

例句：

1. 1. The loudspeaker horn is used to broadcastannouncements during events.
   扩音器喇叭用于在活动中广播公告。
2. 2. Theloudspeakerhorn was the only sound inthe silent room.
   扩音器喇叭是这个寂静房间里唯一的声音。
3. 3. Theloudspeaker horn was usedto play music for the audience.
   扩音器喇叭被用来为观众播放音乐。