infra-red absorption spectrum

例句：

1. 1. The infrared absorption spectrum of the sample is consistent with that of the standard substance.
   样品的红外吸收光谱与标准物质的红外吸收光谱一致。
2. 2.The infrared absorption spectrum was used to identify the chemical composition of the unknown compound.
   红外吸收光谱被用来鉴定未知化合物的化学成分。
3. 3. Infrared absorption spectroscopy is a powerful tool for analyzing the molecular structure of organic compounds.
   红外吸收光谱分析是分析有机化合物分子结构的一种有力工具。