birefraction
重折射双折射 birdfringence
好的……双重彩虹，指的是阳光在透过大气层的湿气时因为折射和反射而出现两道不同彩虹的现象……各位听懂了么?。
Well… A double rainbow is a phenomenon of optics that displays a spectrum of light due to the sun shining onto droplets of moisture in the atmosphere… Does that explain it?
youdao
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