D variometer

例句：

1. 1. The spectrophotometer was used to analyze the chemical composition of the sample.
   分光光度计被用来分析样品的化学成分。
2. 2. The chemist used a spectrophotometer to measure the intensity of the color in the solution.
   化学家使用分光光度计测量溶液中颜色的强度。
3. 3. The scientist conducted an experiment using a spectrophotometer to study the absorption spectrum of a substance.
   科学家使用分光光度计进行实验，研究物质的吸收光谱。