spectrum quantitative analysis

例句：

1. 1. The spectrum of colors in the painting is breathtaking.
   这幅画中色彩的光谱令人惊叹。
2. 2. Spectrum analyzers are used to measure the frequency content of a signal.
   频谱分析仪用于测量信号的频率内容。
3. 3. The scientist used a spectrum analyzer to study the chemical composition of the sample.
   科学家使用频谱分析仪研究样本的化学成分。