dual-wavelength spectrophotometer

例句：

1. 1. This instrument is used for measuring the concentration of various chemicals in a sample.
   这种仪器用于测量样品中各种化学物质的浓度。
2. 2. The dual-wavelength spectrophotometer was used to analyze the chemical composition of the soil samples.
   双波长分光光度计被用来分析土壤样本的化学成分。
3. 3. The dual-wavelength spectrophotometer was used to detect the presence of harmful bacteria in the water samples.
   双波长分光光度计被用来检测水中有害细菌的存在。