double-beam recording spectrophotometer

例句：

1. 1.This double-beam recording spectrophotometer is very useful for analyzing the chemical composition of samples.
   这台双光束记录分光光度计对于分析样品的化学成分非常有用。
2. 2. The double-beam recording spectrophotometer was used to detect the presence of pollutants in the water sample.
   这台双光束记录分光光度计被用来检测水样中污染物的存在。
3. 3. The double-beam recording spectrophotometer was used to analyze the absorption spectra of different compounds.
   这台双光束记录分光光度计被用来分析不同化合物的吸收光谱。