1·Complex life evolved on the Earth's surface, but not on Mars or other planets in the solar system because on those planets, early surface life was killed by UV radiation.
复杂的生命在地球表面进化，而不是在火星或太阳系的其他行星上，因为在那些行星上，早期的地表生命被紫外线杀死了。
2·Melanin helps the body filter out UV radiation, but it also can be harmful.
黑色素可以帮助身体过滤紫外线，但它也有害处。
3·You want a cheaper one that doesn't block a lot of the UV radiation.
要找比较便宜、不会阻隔太多紫外线的那种。
4·Additionally, higher rates of UV radiation exposure were associated with increased rates of melanoma among only the highest two levels of socio-economic status.
另外，仅在2个最高的社会阶层中，人们接触的紫外线越多，患上黑瘤的概率越大。
5·PC endurance plate, for example, weatherability and lighting, the advantages of PC endurance plate to uv radiation shine for a long time, excellent, and energy saving, lit, insulation.
比如说，PC耐力板的耐候性和采光的优越性，PC耐力板能够长时间抗紫外线照耀，作用特优，且节能、通明、绝缘。