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1.The sound of the waterfall is a natural valley attenuation that creates a peaceful environment.
瀑布的声音是山谷衰减，创造了一个宁静的环境。
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2. The forest was so dense that it effectively blocked the valley attenuation, making it difficult to see beyond the trees.
森林非常密集，有效地阻挡了山谷衰减，使得在树木之外很难看到。
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3. The valley attenuation in this region is very low, which means there's less water flowingthrough the area.
这个地区的山谷衰减非常低，这意味着该地区的水流较少。