【美国电台节目】防晒霜你真的会选么？

AUBREY: sunscreen is recommended for people of all ages and skintypes. As for choosing the SPF, lots of sunscreens come in SPF 50 oreven 80. But it turns out the sunscreens with the highest sun protection factoraren't necessarily better.

OYESANYA: SPF 30 issufficient, and that's because SPF 30 is going to filter 97% of the UV raysthat are coming through from the sun. And as we go up in SPF - SPF 50, SPF 75,SPF 100 - you're really getting a minuscule increase.

AUBREY: She tells herpatients to focus less on the SPF and more on the amount of sunscreen they use.And Dr. Orengo agrees. One mistake many people make is using too little. Therecommended amount is about an ounce and a half of liquid sunscreen.

ORENGO: We always say it'slike a shot glass full of sunscreen is for the whole body.

AUBREY: And about a teaspoonfor the face. When it comes to spray sunscreens, Dr. Oyesanya says it's alittle trickier to gauge the amount.

OYESANYA: I think that spraysunscreens are a bit risky. Because of the spray, it's easy to miss a wholearea of your body, especially if you're applying outside. The wind may carrythe sunscreen away.

AUBREY: She says make sureall the parts of your body that need to be covered feel wet after you spray.And remember, you need to reapply about every two hours. Sunscreens don't last very long, especially when people sweatand swim.

JENNIFER HOLMAN: If you'reexposed to the water, even with sunscreens labeled as water resistant, you'rereally only getting about 80 to 90 minutes of protection. AUBREY: So reapplyoften, even on cloudy days. Dermatologists say some of the worst sunburns arelinked to overcast days when people may assume they don't need sunscreen.

HOLMAN: You're still gettingabout 80% of the UV rays filtered through those clouds on a cloudy day. So youabsolutely can still experience damage from UV radiation on a cloudy day.

AUBREY: So keep yoursunscreen handy even when it's not sunny. But Dr. Oyesanya says one mistakepeople make is to leave sunscreen stored in the trunk or glovebox of their car whereit gets too hot.

OYESANYA: The sunscreen isactually being degraded by heat. And so the components of the sunscreen thatare supposed to protect you are getting broken down slowly over time.

AUBREY: One thing you cankeep in your car is clothing or hats to protect you from the sun. Baseball capsprotect part of your face. But dermatologists say what's better is a three-inchbrim hat made with tightly woven material.

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