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。
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。
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。
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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