Complex life evolved on the Earth's surface, but not on Mars or other planets in the solar system because on those planets, early surface life was killed by UV radiation.

复杂的生命在地球表面进化，而不是在火星或太阳系的其他行星上，因为在那些行星上，早期的地表生命被紫外线杀死了。

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A special material on the surface receives UV light from the sun.

表面的一种特殊材料接收来自太阳的紫外线。

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The absence of an oxygen atmosphere on Mars and other planets in our solar system means that these planets also lack an ozone shield that would protect surface-dwelling life from UV radiation.

在火星和我们太阳系的其他行星上没有氧气，这意味着这些行星也缺乏保护地表生物免受紫外线辐射的臭氧层。

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Initially, the idea was to use plastic flexible displays (as evidenced by previous XO 3.0 renders), but degradation caused by the sun's UV rays and plastic's easily scratched surface forced the company to switch gears and use glass instead.

ENGADGET: OLPC's XO 3.0 tablet hands-on (video) Hands-on

But the increased ultra-violet (UV) solar radiation which the damaged ozone allows through to the surface of the earth is a threat to all living things.

BBC: By Environment Correspondent Alex Kirby