UVB irradiation may cause sunburn,immunosuppression, oxidative stress, DNA damage, increased rate ofgene mutation and the secretion of cytokines, even skin non-melanomaand melanoma cancers as well as premature aging of the skin so-calledphotoaging.
特别是UVB辐射可导致日晒伤，自由基及活性氧的形成，引起细胞因子产生与分泌，局部及系统免疫抑制，细胞DNA损伤及突变频率增加，甚至导致皮肤光老化及皮肤癌肿。
参考来源 - 绿茶提取物光保护作用系列研究·2,447,543篇论文数据，部分数据来源于NoteExpress
普通日晒伤就是一度烧伤的典型例子。
Ordinary sunburn is the most common example of a first-degree burn.
青少年使用日晒机后晒伤的案例已经不计其数。
There have been a number of cases where teenagers have become burned after using tanning booths.
图2、3：在詹姆斯·哈德利的无人日晒沙龙使用太阳床造成严重晒伤以前，女学生柯丝蒂·麦克雷(Kirsty McRae)的生活照见图2。
Pic.2, 3: Schoolgirl Kirsty McRae pictured before she used a sunbed in James Hadley's unmanned tanning salon which gave her severe burns.
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