As contraction continues and the density increases, the dust becomes so thick at the center of the cloud that it absorbs the far-infraredradiation.
当收缩过程继续进行下去，密度不断增大时，气尘云中心的尘埃就会变得极其浓密，因而能够吸收远红外辐射。
2
The research and development of far-infraredradiation glaze was presented and reviewed. And the materials, function, produce and usage of far-infraredradiation have been discussed in detail.