地球臭氧层位于平流层，过滤来自太阳的紫外线辐射。
This is where the planet's ozone layer sits, filtering out ultraviolet radiation from the sun.
但是星期四安装的一座空气过滤系统把辐射程度降低到一个高点，但是是比较能接受的水平。
But an air filtration system installed Thursday has brought radiation down to a high, but more acceptable, level.
汉森的研究小组发现当皮肤处在紫外线辐射之下，三种广泛用于防晒产品中的紫外线过滤成分也会生成活性氧簇ros。
Hanson's research team found that three UV filters widely used in sunscreens generate ROS when skin is exposed to UV radiation.
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