Lying in the part of the infrared spectrum farthest from the red: used of radiations with wavelengths between 30 and about 1000 microns.

远红外的(指红外线光谱中距红色最远的，波长30到1000微米的幅射)。

Lying in the part of the infrared spectrum nearest to the red: used of radiations with wavelengths starting at about 0.8micron.

远红外的(指红外线光谱中距红色最近的，波长约0.8微米起的幅射)。