analog signals

例句：

1. 1. Analog signals are used to transmit data over long distances.
   模拟信号被用来在长距离上传输数据。
2. 2.The digital signal has replaced the analog signal in many applications.
   数字信号在许多应用中取代了模拟信号。
3. 3. In the old days, analog signals were transmitted over telephone lines.
   在旧时代，模拟信号通过电话线进行传输。