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。
No other gases would be present to prevent ultraviolet solar radiation dissociating water vapour at the top of the atmosphere.
臭氧层通常能吸收95% - 99.9%的来自太阳辐射的紫外线，保护地球上的生命免受这种形式的能量的生物性损害。
The layer normally absorbs 95 to 99.9 percent of the ultraviolet radiation from the sun, protecting life on Earth from this biologically damaging form of energy.
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。
Photochemical smog: Smog produced by action of solar radiation, especially of ultraviolet radiation, on exhausts from vehicles and industry.
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