spectrum types

例句：

1. 1. The study of spectra is crucial for understanding the nature of light.
   研究光谱对于理解光的本质至关重要。
2. 2.Different spectral types can be found in different parts of the galaxy.
   不同光谱类型的星系分布在银河的不同区域。
3. 3. Spectrum types are classified based on their wavelengths and intensities.
   光谱类型是根据它们的波长和强度来分类的。