principal absorption wavelength

例句：

1. 1.The absorption of light by the material is crucial for its performance.
   材料对光的吸收对其性能至关重要。
2. 2. The absorption spectrum of the compound was studied to understand its properties.
   研究了这种化合物的吸收光谱，以了解其性质。
3. 3. The absorption of sunlight in this region is low due to the lack of vegetation.
   由于缺乏植被，该地区的阳光吸收率很低。