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UVB rays 中波紫外线 “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 UVB rays, which are related to sunburn and skin cancer. But SPF only measures UVB rays; it doesn’t tell you anything about protection from UVA rays, Kundu says. 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。 | 
