touch-tone的用法和样例：
词汇搭配
- touch-tone phone 按键式电话
- touch tone 按键音双音多频拨号音...
- touch tone dialing 按钮式音频拨号...
- touch tone receiver 按键音接收器...
- touch tone telephone 按键式电话机...
- touch tone telephone set 按键式电话机...
- touch tone adapter 双音多频拨号音转换器...
- touch tone data service 按键式数据服务...
- touch tone signal 双音双频信号...
- touch tone signaling 双音双频音信号方式...
- touch tone dial 按键音拨号器...
