The loudspeaker is connected to a sound generator whose frequencies can be changed.
扬声器连接一台频率可以改变的声音发电机.
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A loudspeaker and a microphone are set up facing each other a few metres apart.
一个扬声器和一个话筒建立相隔几米的对放.
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Later, we bought a small loudspeaker at home during the popularization of the wire broadcasting.
后来,普及有线广播,家里也买了个小喇叭。
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研制, 生产及销售专业音响器材. 包括: 专业音箱, 功放,调音台及周边器材.
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It was difficult to make out what was said over the loudspeaker in the square.
很难听清广场上的扩音喇叭里在说些什么.
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