spectrum classes

例句：

1. 1. The spectrum of colors in the rainbow is a fascinating study.
   彩虹中颜色的光谱是一个引人入胜的研究。
2. 2. The classification of species into different spectra is crucial for conservation efforts.
   将物种分类到不同的光谱对于保护工作至关重要。
3. 3. In this study, we classified the data into three main spectra based on their characteristics.
   在这项研究中，我们根据它们的特性将数据分为三个主要光谱。