Researchers have discovered that Arctic reindeer can see ultraviolet light that would blind humans.

研究人员发现，北极驯鹿可以看到会导致人眼失明的紫外线。

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But it doesn't make sense to live by a 24-hour clock in the Arctic, where it's dark or light for months at time.

但是在北极，每次白天和黑夜都要持续好几个月，24小时的生物钟似乎没什么意义。

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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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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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