FM transmitter

例句：

1. 1. The FM transmitter was usedto broadcast the news from the control room.
   调频发射机被用来从控制室广播新闻。
2. 2. The FM transmitter wasused to transmit signals over long distances.
   调频发射机被用来在长距离上传输信号。
3. 3. The FM transmitterwas used to transmit audio signals over theairwaves.
   调频发射机被用来在空中波上传输音频信号。