noise contours

例句：

1. 1.The noise contours of the city are changing rapidly due to urbanization.
   由于城市化，城市中的噪声轮廓正在迅速变化。
2. 2.The noise contours in the forest were so dense that it was hard to hear anything over the sound of the wind.
   森林中的噪声轮廓如此密集，以至于很难听到任何声音，因为风声太大。
3. 3.The researchers used noise contours to map out the distribution of wildlife in the area.
   研究人员使用噪声轮廓来绘制该地区野生动物的分布图。