frequency-change signalling

例句：

1. 1. The new communicationsystem uses frequency-change signalling to transmit data over long distances.
   新通信系统使用频率变化信号传输在长距离上传输数据。
2. 2. In the field of wireless communications, frequency-change signalling is a technique used to adjust the frequency of a radio signal.
   在无线通信领域，频率变化信号传输是一种调整无线电信号频率的技术。
3. 3. This method of frequency-change signalling has been proven to be more efficient than traditional methods in certain applications.
   这种方法的频率变化信号传输已被证明在某些应用中比传统方法更有效。