spectrum comparator

例句：

1. 1. The spectrum comparator was used to analyze the chemical composition of the sample.
   光谱比较器被用来分析样品的化学成分。
2. 2. The scientist used the spectrum comparator to compare the absorption spectra of different samples.
   科学家使用光谱比较器来比较不同样品的吸收光谱。
3. 3. The spectrum comparator helped the researchers in identifying the molecular structure of the unknown compound.
   光谱比较器帮助研究人员识别了未知化合物的分子结构。