用扩音器把电波变成声波并把无线电播放的消息和节目的声响变得高一些，许多人在同一时间都能听到。

Loudspeaker is used to change electric waves into sound waves and to make radio messages and radio programmes sound louder so that many people can hear them at the same time.

youdao

和大家分享我在演唱会拍的照片…原谅我没有在第一时间把照片送上来…因为我的笔电又出现问题…而昨日我还在回家的路途中。

Here are the pics I took at the concert for sharing... apologise for not uploading the pics earlier since I got problems with my laptop again!

youdao