So it's important to lather up with some protective sunscreen if you're going to be spending time in the sun - especially during warmer summer months, when the UV Index rises and the sun becomes more potent.
因此,如果要长时间暴露在阳光下——尤其是在炎热的夏季,紫外线指数升高,日光变得更强烈时——及时涂上一些防晒霜变得尤为重要。
We enlisted the help of two skin experts to explain just how long sunscreen lasts and how to re-apply it correctly. Here's their best advice:
我们邀请了两位皮肤专家来帮助我们了解防晒霜的持续时间以及如何正确地再次涂抹防晒霜。下面是他们提供的最佳建议:
Your sunscreen SPF is only 100 percent guaranteed for two hours after you put it on
当你抹上防晒霜之后,其SPF的100%效力只能保证两个小时
"When we talk about reapplying sunscreen every two hours, that number comes from how SPF is tested," John Zampella, a dermatologist at NYU Langone Health, said.
“当我们建议说每隔两个小时就要重新涂抹防晒霜时,是因为这个数字来自于SPF值的测试方式,”纽约大学朗格尼医学中心的皮肤科医生John Zampella说道。
He explained that SPF numbers are based on how much protection a certain sunscreen will give you against the sun for two hours.
他解释说,SPF值是基于某特定防晒霜在两个小时内抵御阳光的能力得出的。
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