infra-red spectrogram

例句：

1. 1. Theinfrared spectrogram of thesample shows a strong absorption peak at1400 cm⁻¹.
   样品的红外光谱图显示在1400 cm⁻¹处有一个强烈的吸收峰。
2. 2.The infrared spectrogram wasused to identify the chemical composition of theunknown substance.
   红外光谱图被用来识别未知物质的化学成分。
3. 3. The infraredspectrogram revealed that the sample containedtrace amounts of water vapor.
   红外光谱图显示样本中含有微量的水蒸气。