The Global UV Index, from low (green) to extreme (purple)

全球紫外线指数，从低（绿色）至极高（紫色）

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The lead researcher says that the animals may have evolved ways of protecting their retinas against the kind of extreme exposure to UV light common in the Arctic.

首席研究员表示，这种动物不断进化，可以保护他们的视网膜免受北极常见的紫外线的伤害。

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