云量：在晴朗无云的天空，紫外线辐射水平最高。但是，即使有云层，紫外线辐射水平也可以很高。
Cloud cover: UV radiation levels are highest under cloudless skies but even with cloud cover, they can be high.
一项研究表明，在葡萄中发现的化合物能保护皮肤细胞，防止太阳紫外线的辐射，而紫外线正是诱发皮肤癌的首要环境因素。
A study has shown that compounds found in the fruit protect cells from the ultraviolet radiation emitted by the sun - the leading environmental cause of skin cancer.
阳光下活动减少意味着暴露于紫外线辐射的时间缩短，而紫外线辐射会生成自由基，对机体造成损害并加速组织衰老。
Reducing the time spent in sunlight helps minimise exposure to UV radiation, which creates free radicals known to damage and age tissues prematurely.
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