IR spectroscopy

例句：

1. 1. The researchers usedIR spectroscopy to analyzethe chemical composition of the sample.
   研究人员使用红外光谱学分析样本的化学成分。
2. 2. Infrared spectroscopy is apowerful tool for identifying and analyzing organic compounds.
   红外光谱学是一种强大的工具，用于识别和分析有机化合物。
3. 3. TheIR spectroscopy technique has been widely usedin the field of environmental science.
   红外光谱技术在环境科学领域得到了广泛应用。