spectrum of radiation

例句：

1. 1. The scientist used a spectrometer to analyze the chemical composition of the sample.
   科学家使用光谱仪分析样本的化学成分。
2. 2. The physicist discovered a new spectrum of light that could be used for medical imaging.
   物理学家发现了一种新的光谱，可以用于医学成像。
3. 3.The astronomer observed the spectrum of stars in the night sky.
   天文学家观察了夜空中恒星的光谱。