spectral radiant exitance

例句：

1. 1. Thespectral radiant exitance of thesun's light is measured by scientiststo understand its energy output.
   科学家通过测量太阳光的光谱辐射出射度来了解其能量输出。
2. 2. In thisexperiment, we are measuringthe spectral radiant exitance of different materials.
   在这个实验中，我们正在测量不同材料的光谱辐射出射度。
3. 3. The spectral radiant exitance of a certain wavelength is used todetermine the composition of the material.
   某种波长的光谱辐射出射度被用来确定材料的成分。