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。
However, the Bell System was intrigued by touch-tone because it increased the speed of dialing.
youdao
它的特点是速度增加。
It is also characterized by the increased speed.
应用推荐
模块上移
模块下移
不移动