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科学美国人60秒 SSS Umbrellas Plus Sunscreen Best Bet to Beat Burns

时间:2017-03-06 07:05来源:互联网 提供网友:nan   字体: [ ]
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Last time you hit the beach—and yeah, probably seems like a distant memory in the currently chilly1 parts of the world—did you pack sunscreen? A beach umbrella? Or both?

Researchers put the two sun-protecting products to the test. First contender: a beach umbrella, which they evaluated with a spectrophotometer to see if UV rays passed through. They didn't…good sign so far. The second contender was sunscreen: 100 SPF.

Then the scientists rallied 81 people to go sunbathing2 at a lake outside Dallas, for three hours around mid-day. Half got beach umbrellas. The other half, all-you-can-apply sunscreen. And because this is science—not a day at the beach, eh, let me rephrase that, not a walk in the park—the participants were not allowed to take a dip.

Twenty four hours after the solar exposure—enough time for any sunburns to ripen—the researchers visually inspected the sunseekers' skin. And they found that three times as many umbrella-sitters had sunburns somewhere on their bodies, compared to their sunscreen-slathering neighbors. And since the umbrellas themselves block UV rays, the burns are likely due to UV light bouncing off the sand and other surfaces, then hitting unprotected skin. The study is in JAMA Dermatology. [Hao Ou-Yang et al., Sun Protection by Beach Umbrella vs Sunscreen With a High Sun Protection Factor A Randomized Clinical Trial]

The caveat3? Even sunscreen users weren't completely burn-free. So the researchers—some of whom, full disclosure, work at Johnson & Johnson, which makes sunscreen—instead recommend hedging your bets. Wear a wide-brimmed hat. Sit in the shade. Use sunblock, too. To ensure you don't need that fourth strategy: aloe vera.

—Christopher Intagliata


点击收听单词发音收听单词发音  

1 chilly pOfzl     
adj.凉快的,寒冷的
参考例句:
  • I feel chilly without a coat.我由于没有穿大衣而感到凉飕飕的。
  • I grew chilly when the fire went out.炉火熄灭后,寒气逼人。
2 sunbathing bb1a8564f9c25f1e1db56b2b14f574cb     
n.日光浴
参考例句:
  • tourists sunbathing on the beach 在海滩上沐浴着阳光的游客
  • We've been sunbathing on the beach. 我们一直在海滩上晒日光浴。
3 caveat 7rZza     
n.警告; 防止误解的说明
参考例句:
  • I would offer a caveat for those who want to join me in the dual calling.为防止发生误解,我想对那些想要步我后尘的人提出警告。
  • As I have written before,that's quite a caveat.正如我以前所写,那确实是个警告。
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TAG标签:   科学美国人60秒  英语听力  sss
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