We all need vitamin d, which is a nutrient that can be obtained by catching some rays.

我们都需要维生素d，它可以通过光照获取。

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The irony is that the same UV rays that trigger vitamin D production in your body also produce chemical changes in the skin's DNA.

具有讽刺意味的是，紫外线在你身体里产生维他命D时候同样也会改变你皮肤的DNA结构。

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The sun's rays, in moderation, are beneficial to the human body, which produces vitamin d, which is essential to help the body absorb calcium from food.

适度接受阳光照射对人体是有益的并能帮助人体生成维生素d，可以有效帮助人体吸收食物中的钙物质。

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C.D.C.officials say U-V rays can damage your skin in as little as fifteen minutes.

VOA: special.2010.07.06

Games aside, the system can play 3-D Blu-rays and movie downloads.

CNN: Motion, 3-D gaming right at home at CES

Until the 1980s radiation oncologists could only crudely estimate where to aim based on the position of nearby bones in 2-D X rays.

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