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。
The puny atmosphere on the planet is not strong enough to shield the planet against lethal solar radiation, though microbes could potentially exist beneath the surface.
火星稀薄的大气层不足以抵挡致命的太阳光辐射。但是地表之下，可能生活着微生物。
The puny atmosphere on the planet is not strong enough to shield the planet against lethal solar radiation, though microbes could potentially exist beneath the surface.
火星稀薄的大气层不足以抵挡致命的太阳光辐射。但是地表之下，可能生活着微生物。
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