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The health benefits of exposing skin to sunlight may far outweigh the risk of developing skin cancer, according to scientists.
受太陽光照射雖然有患上皮膚癌的風險，但是它所能給人體健康帶來的積極作用更大。
Edinburgh University research suggests sunlight helps reduce blood pressure, cutting heart attack and stroke risks and even prolonging life.
愛丁堡大學研究表明，陽光有降血壓、減少心臟病和中風發病率、甚至延年益壽的功效。
UV rays were found to release a compound which lowers blood pressure.
研究人員發現紫外線能使人體產生一種降血壓的化合物。
Researchers said more studies would be carried out to determine if it is time to reconsider advice on skin exposure.
他們還表示將進一步調查是不是應該建議人們接受更多光照。
Heart disease and stroke linked to high blood pressure are estimated to lead to about 80-times more deaths than those from skin cancer in the UK.
據估計，英國因高血壓引起的心臟病和中風死亡的人數是死于皮膚癌人數的將近80倍。
Production of the pressure reducing compound is separate from the body's manufacture of vitamin D, which rises after exposure to sunshine.
人體生成降壓化合物和維生素D是兩個獨立的過程。維生素D含量的增加發生在接受光照之后。
Researchers said that until now vitamin D had been thought to solely explain the sun's benefit to human health.
而之前人們對太陽有益健康的唯一解釋就是它能促進生成維生素D。
During the research, researchers studied the blood pressure of 24 volunteers under UV and heat lamps.
研究試驗中，24位志愿者置身在有紫外線或熱量燈的環境之中，研究人員觀測他們的血壓水平。
In one session, the volunteers were exposed to both the UV rays and the heat of the lamps.
受試者分成兩組，一組受紫外線和熱量燈的雙重影響。
In the other, the UV rays were blocked so that only the heat of the lamps affected the skin.
另一組環境中的紫外線被遮擋，只受燈的影響。
The results showed that blood pressure dropped significantly for one hour following exposure to UV rays, but not after the heat-only sessions.
結果顯示，接受一小時紫外線照射的志愿者血壓明顯降低，但是只受燈熱量影響的志愿者血壓沒有這種變化。
Scientists said that this suggested it was the sun's UV rays that lead to health benefits.
科學家說這就表明陽光中的紫外線對人體健康有益。
The volunteers' vitamin D levels remained unaffected in both sessions.
兩組志愿者體內維他命D水平在試驗期間未受影響。
The study will be presented in Edinburgh at the world's largest gathering of skin experts.
該研究將被拿到愛丁堡世界最大的皮膚專家會議上討論。
Questions 23-25 are based on the passage you have just heard.
請根據剛剛聽到的短文回答23-25題。
Question 23. What can be learned from Edinburgh University's research?
23.從愛丁堡大學的研究中我們了解到什么？
Question 24. What was thought to be the only element to explain sun's benefit to human health?
24.過去什么被認為是能夠解釋太陽對健康有益的唯一因素？
Question 25. Which element is said to be unaffected in the research?
25.試驗過程中哪項因素未受影響？
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