... touch-tone phone 按键式电话 MF touch-tone 复频式按键 touch-tone telephone 按键式电话机 ; 音频式电话 ...
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Signaling took the form of a series of multifrequency (MF) tones, much like touch tone dialing between switches.
信号将一系列的方式多频(MF)音调,很像之间互动音频拨号开关。
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