No other gases would be present to prevent ultraviolet solar radiation dissociating water vapour at the top of the atmosphere.

没有其他的气体去阻止紫外太阳辐射离解大气层顶的水汽。

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Photochemical smog: Smog produced by action of solar radiation, especially of ultraviolet radiation, on exhausts from vehicles and industry.

太阳辐射，尤其是紫外线辐射对汽车和工业所排放的废气产生光化作用而形成的烟雾。

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Because of rotation and revolution of the earth, solar ultraviolet radiation intensity varies in diurnal and annual periodic.

由于地球自转和公转的原因，太阳紫外线辐射强度呈现出以一年和一天为周期的规律性变化。

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Because of abundant solar ultraviolet radiation at the surface, organic molecules might not be preserved as well as clay minerals.

CNN: Have a drink on Mars

The rooms' outer walls are each filled with 250lbs of insulating polyethylene to protect astronauts during solar flares and damaging ultraviolet radiation.

BBC: A space of one's own