This is because, in the absence of a protective ozone layer, the land was bathed in lethal levels of UV radiation.
这是因为，在没有防护臭氧层时，土地沐浴了在紫外辐射的致死的水平。
Ozone forms a protective layer between 12 and 30 miles above the Earth's surface.
臭氧在距地球表面12至30英里的地方形成一个保护层。
Scientists have disclosed further details about a giant hole in the protective Ozone layer above the arctic. It matched the size of those found regularly over Antarctic .
科学家透露更多关于北极具保护性的臭氧空洞问题，面积相当于南极的空洞。
The US satellite was deployed in 1991 from the space shuttle Discovery on a mission to study the make-up of Earth's atmosphere, particularly its protective ozone layer.
美国卫星是在1991年部署到发现号航天飞机上的，承载着研究地球大气层，尤其是其起保护作用的臭氧层成分的使命。
The US satellite was deployed in 1991 from the space shuttle Discovery on a mission to study the make-up of Earth's atmosphere, particularly its protective ozone layer.
美国卫星是在1991年部署到发现号航天飞机上的，承载着研究地球大气层，尤其是其起保护作用的臭氧层成分的使命。
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