用按键或按钮代替旋转式拨号盘，产生一个数字序列以建立电路连接的方法。

The use of keys or push-buttons instead of a rotary dial to generate a sequence of digits to establish a circuit connection.

youdao

用按键或按钮代替旋转式拨号盘，产生一个数字序列以建立电路连接的方法。

The use of keys or push-buttons instead of a rotary dial to generate a sequence of digits to establish a circuit connection.

youdao