differential spectrophotometer

例句：

1. 1.The differential spectrophotometer was used to analyze the chemical composition of the sample.
   差分光谱仪被用来分析样品的化学成分。
2. 2.The differential spectrophotometer was used to detect the presence of certain elements in the sample.
   差分光谱仪被用来检测样品中某些元素的出现。
3. 3. The differential spectrophotometer was used to measure the absorption and emission spectra of the sample.
   差分光谱仪被用来测量样品的吸收和发射光谱。