喇叭扩音器

例句：

1. 1. The police used loudspeakers to issue an emergency warning.
   警方使用扩音器发出紧急警告。
2. 2. Theteacher placed the loudspeaker onthe desk so that all students could hearit clearly.
   老师把扩音器放在桌子上，以便所有学生都能清楚地听到。
3. 3.The band played their music through the loudspeaker during the concert.
   乐队在音乐会上通过扩音器演奏他们的音乐。