防晒霜到底怎么选？看完这篇科普再也不迷茫了
<p><span word="UVB">UVB</span> <span word="rays">rays</span></p><p>中波紫外线</p><p>“People think that SPF equals everything,” says Dr. Roopal Kundu, a dermatologist at Northwestern University Feinberg School of Medicine. And it does count for a lot: the sun protection factor measures a sunscreen’s ability to filter <span word="UVB">UVB</span> <span word="rays">rays</span>, which are related to sunburn and skin cancer. But SPF only measures <span word="UVB">UVB</span> <span word="rays">rays</span>; it doesn’t tell you anything about protection from <span word="UVA">UVA</span> <span word="rays">rays</span>, Kundu says.</p><p>西北大学费因伯格医学院皮肤科医生昆都称：“人们认为防晒系数代表一切。”防晒系数的确很重要：它衡量的是防晒霜过滤中波紫外线的能力，中波紫外线与晒伤和皮肤癌有关。但防晒系数仅表示过滤中波紫外线的能力，它并不代表任何防护长波紫外线的能力。</p>
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