characteristic absorption band

例句：

1. 1.The absorption band of the material is very narrow.
   这种材料的吸收带非常窄。
2. 2. This absorption band helps us to understand the properties of the material.
   这个吸收带帮助我们了解材料的性质。
3. 3.The absorption band of the material is used to determine its chemical composition.
   这个吸收带用于确定材料的化学组成。