data of dark-line spectrum

例句：

1. 1. The dark-line spectrum of the star is fascinating.
   这颗星的暗线光谱令人着迷。
2. 2.The researcher used the dark-line spectrum to study the chemical composition of the sample.
   研究者利用暗线光谱研究了样品的化学成分。
3. 3.The dark-line spectrum was used to identify the source of the radiation.
   暗线光谱被用来识别辐射的来源。