Optical radiation is just visible light energy spreading out.

光辐射就只是扩散的可见光能量。

youdao

And on top of that, when that visible radiation bounces off those molecules, it scatters in all directions.

除此以外，当可见光波从这些分子上反射出去时，它会向四面八方扩散。

youdao

The researchers tested their new black material with near-infrared radiation, just beyond the red end of the visible spectrum.

研究人员们使用仅仅超出可见光谱红端的近红外辐射测试他们的新“黑材料”。

youdao

I'm looking outside now and that's electromagnetic radiation - visible light.

BBC: NEWS | UK | Magazine | Wi-fi worry

When it is ground into nanoparticles it can still block harmful ultraviolet radiation, but it allows visible light to pass straight though, which means modern sunscreens can appear completely transparent, while offering the same protection as the old white stuff.

ECONOMIST: The risk in nanotechnology

The telescope gathers and focuses electromagnetic radiation (usually, but not always, visible light) to make far-off objects seem brighter and closer.

FORBES