analog signalling

例句：

1. 1.The new phone uses a digital signallingsystem to transmit data.
   这款新手机使用数字信号传输系统来传输数据。
2. 2. Analogsignalling is not suitable for long-distance communication due to its limited bandwidth.
   由于带宽有限，模拟信号传输不适合长距离通信。
3. 3. In the old days, people usedto communicate by sending messages through the postoffice using analog signalling.
   在旧时代，人们通过邮局使用模拟信号传输来发送消息进行通信。