英文阅读：阳光能抗癌吗？

英语自学网

　　我们都知道强烈的阳光辐射会导致癌症，殊不知阳光也是抗癌的自然药物。下面我们就来看看它是如何抗癌的。
        　　Although too much exposure to the sun's ultraviolet rays can cause skin
cancer, sunshine may have protective effect against some cancers, a U.S.
scientist said in April. He said vitamin D, the so -called sunshine vitamin can
help to slow down the speed at which cancer cells divide. It is abundant in cod
liver oil, fortified milk and dairying products, and some fatty fish. The study
found inverse associations between both residential and occupational exposure to
sunlight and mortality from female breast and colon cancers.
        　　Scientists found the more deaths from skin cancer in sunnier states but the
number of people who died from the other cancers was lower in sunshine area.
Working outdoors in a sunny climate was also associated with fewer breast and
colon cancer deaths but not with the other cancers.