noise spectrum

例句：

1. 1. The noisespectrum of the traffic is constantly changing.
   交通的噪声谱一直在变化。
2. 2. The noise spectrum analysis helps us understand the source of the noise.
   噪声谱分析有助于我们理解噪声的来源。
3. 3. The noise spectrum can be used to measure the level of noise pollution in a region.
   噪声谱可以用来测量一个地区的噪声污染水平。