播送从一发射机发送信号、图像或其它信息 The sending of a signal, picture, or other information from a transmitter.
扩音器,麦克风,话筒将声波转变成电流的工具,通常接至扩音器,录音机或广播发射机上 An instrument that converts sound waves into an electric current, usually fed into an amplifier, a recorder, or a broadcast transmitter.
有些真正的狂热家甚至自己制造电唱机和无线电发射机。 Some really keen enthusiasts go so far as to build their own record players and radio transmitters.