narrow beam absorption

例句：

1. 1.The narrow beam absorption of the light is very weak.
   这种光的狭窄梁吸收非常弱。
2. 2. The narrow beam absorption of the light is used to measure the intensity of the light.
   这种光的狭窄梁吸收被用来测量光的强度。
3. 3.The narrow beam absorption of the light is used to study the properties of materials.
   这种光的狭窄梁吸收被用来研究材料的性质。