UVB is a key factor of skin collagen damage in UV-irradiation.

UVB是UV造成皮肤胶原损害的关键成分。

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UVA rays also penetrate clouds more readily than UVB rays, putting those that head outdoors, even on gloomy days, at risk of a burn or other skin damage.

UV A射线还比uv B射线更容易的穿透云层，即使在阴暗的日子里，也有皮肤灼烧或其他皮肤损害的风险。

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SPF 30 sunscreen protects skin against damaging UVA and UVB rays. Vitamin E and Pro-Vitamin B5 formula helps protect skin from environmental damage caused by free radicals.

SPF 30 的防晒值，抵御UVA和UVB，维他命E和维他命原B5，帮助保护皮肤免受环境污染造成的自由基损害。

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Both UVA and UVB rays contribute to skin cancer, but the damage caused by UVA rays is harder to measure.

WSJ: European Sunscreen Roadblock on U.S. Beaches