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As sunscreen ages, its sun-protection ingredients degrade, reducing its effectiveness. 防晒霜老化后，防晒成分的纯度会降低，导致防晒效果变差。 Keeping a fresh bottle on hand, and using it every time you’re out in the sun, will keep you from getting sunburned and also help prevent skin cancer, the most common cancer of all. 准备一瓶保质期新鲜的防晒霜，每次出门有日晒时拿来用，能够防止晒伤，还能预防最常见的癌症皮肤癌。 If your sunblock doesn’t have an expiration date on the bottle for some reason, though, keep Dr. Shari Lipner’s advice in mind. 如果你的防晒霜不知为什么没有保质期，那就谨记莎莉•李普诺医生的建议。 | 
