low-frequency spectrum

例句：

1. 1.The low-frequency spectrum of the signal is used to determine its frequency components.
   信号的低频谱用于确定其频率成分。
2. 2.In radio engineering, the low-frequency spectrum is crucial for understanding the propagation of radio waves.
   在无线电工程中，低频谱对于理解无线电波的传播至关重要。
3. 3. The low-frequency spectrum analysis helps in identifying the dominant frequencies present in the signal.
   低频谱分析有助于识别信号中的主导频率。