But as I picked up the wireless microphone and began my speech, I realized in horror that my public address system was silent.
2
银川哪里有卖教学无线扩音器的？
Where does Yinchuan have selling the wireless microphone teaching's?
3
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.
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