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什麼是紫外線
紫外線是由UVA和UVB所組成的,UVA和UVB最大的分別在於輻射波長。
波長較長的UVA(ageing)會穿透到肌膚深層,產生自由基,破壞膠原蛋白,令肌膚提早老化。
而UVB(burning)會照射到表皮細胞,令肌膚曬傷以及變黑。
此外,陽光照射在反射的表面上,如:水和雪,會增加紫外線量,所以到海邊和雪地都很容易曬傷。
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