scattering threshold

例句：

1. 1. The researchers found that the scattering threshold for light in this region is very low.
   研究人员发现，这个区域的光散射阈值非常低。
2. 2. At the scattering threshold, the particles are too small to be seen clearly.
   在散射阈值处，粒子太小而无法清晰可见。
3. 3. The scattering threshold of a material can be used to determine its density and other properties.
   材料的散射阈值可以用来确定其密度和其他属性。