扩散辐射是指自然界中的一切物体，只要温度在绝对温度零度以上，都以电磁波的形式时刻不停地向外传送热量，这种传送能量的方式。
城乡结合部转型过程是城乡结合部自身模仿、融入城市以及城市的扩散辐射效应嵌入的过程；
The transition of the community between rural and urban areas is their imitation and incorporation into the urbanization, and the effect of their spread and radioaction.
但是辐射作为一个通用术语，实际是指所有从其源头扩散开来的东西。
But radiation as a general term actually refers to anything that spreads away from its source.
光辐射就只是扩散的可见光能量。
Optical radiation is just visible light energy spreading out.
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