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.
但随着时间的推进，越来越多的人将会发现并使用手机播放无线电广播。
But over time, more people will discover and use cell-phone-streamed radio.
这条消息通过无线电向全世界播放。
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