... touch-tone telephone 按键式电话机 ; 音频式电话 touch-tone dialing 按键式拨号 touch-tone signalling 按键式信号发送 ...
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However, the Bell System was intrigued by touch-tone because it increased the speed of dialing.
然而，贝尔系统推出的触摸式的语气，因为它增加的速度拨号。
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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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