Task: Translation
Input (Spanish): The predetermined substance group contains the plastic, and each infrared absorption spectrum of the infrared absorption spectrum group is obtained by allowing the infrared ray of the predetermined wave number to be incident on each substance contained in the predetermined substance group, and measuring the intensity of the infrared ray totally reflected in the substance.
Output (English): El grupo de substancias predeterminado contiene el plastico, y cada espectro de absorcion infrarrojo del grupo de espectro de absorcion infrarrojo se obtiene al permitir que el rayo infrarrojo del numero de onda predeterminado sea incidente en cada substancia contenida en el grupo de substancias predeterminado, y medir la intensidad del rayo infrarrojo talmente reflejado en la substancia.