bifrequency

例句：

1. 1.The device has a bifrequency response to the signal.
   该设备对信号具有双频率响应。
2. 2.The bifrequency spectrum is used for frequency analysis.
   双频谱用于频率分析。
3. 3. The bifrequency method is more accurate than the traditional method.
   双频法比传统方法更准确。