cumulative spectra

例句：

1. 1. The study of cumulative spectra is crucial for understanding the behavior of materials under different conditions.
   研究累积光谱对于理解材料在不同条件下的行为至关重要。
2. 2.The scientists used a new technique to analyze the cumulative spectra of the samples.
   科学家们使用一种新的技术来分析样本的累积光谱。
3. 3.The researcher found that the cumulative spectra of the molecules showed significant differences in their electronic properties.
   研究人员发现分子的累积光谱显示出在电子性质方面有显著的差异。