normal-incidence absorption coefficient

例句：

1. 1. Theabsorption coefficient of this material is very high, which makes it difficult to process.
   这种材料的吸收系数非常高，这使得加工变得非常困难。
2. 2. In order to improve the efficiency of solar panels, researchers are studying how to reduce the absorption coefficient of the material.
   为了提高太阳能电池板的效率，研究人员正在研究如何降低材料的吸收系数。
3. 3. The absorption coefficient of light in a certain medium depends on its refractive index and the angle of incidence.
   光在某种介质中的吸收系数取决于其折射率和入射角。