loudspeaker for colour TV

例句：

1. 1. The loudspeaker was playing a soothing melody.
   扬声器正在播放一首令人放松的旋律。
2. 2. The concert hall had several loudspeakers installed to enhance the sound quality.
   音乐会厅安装了多个扬声器来提高音质。
3. 3. The loudspeaker system is responsible for broadcasting the news from the studio.
   扬声器系统负责从演播室广播新闻。