Optical radiation is just visible light energy spreading out.
光辐射就只是扩散的可见光能量。
Visible light is just one form of radiation.
可见光只是辐射的一种形式。
Because less then 5% of the sun spectrum is ultraviolet radiation and 43% is visible light.
而太阳光谱中紫外光区占不到5%，可见光区则占43%。
Because less then 5% of the sun spectrum is ultraviolet radiation and 43% is visible light.
而太阳光谱中紫外光区占不到5%，可见光区则占43%。
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