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。
Here the benefits of dark skin are outweighed by the need for bone-strengthening vitamin d, produced through exposure to UV rays.
这个地区人们通过照射紫外线来获取骨骼生长所需要的维他命d，所以深肤色的优势已凸显不出。
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。
Because ultraviolet rays also trigger the synthesis of vitamin D in the skin, sunlight is an important source of the vitamin.
由于紫外线也可以触发皮肤中维生素d的合成，因此日晒是维生素d的一个重要来源。
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。
This method USES the speeds of seismic waves from distant earthquakes to map features of the crust and upper mantle in 3-d-similar to the way medical CT scans use x-rays to map the human body.
这个方法使用来自远地地震的地震波的速度以绘制地壳和上地幔的3 - D图像- - -和医学CT扫描仪用X射线绘制人体的方法相似。
The sun's rays, in moderation, are beneficial to the human body, which produces vitamin d.
适度的太阳光有益于人体制造维生素d。
With each family member, they isolated purified enzyme, grew crystals of pure enzyme, and figured out the enzyme's 3-d structure by using techniques that use X-rays.
针对每个成员，他们分离纯化酶，用纯酶生长晶体，并用x -射线等技术描绘出酶的三维结构。
With each family member, they isolated purified enzyme, grew crystals of pure enzyme, and figured out the enzyme's 3-d structure by using techniques that use X-rays.
针对每个成员，他们分离纯化酶，用纯酶生长晶体，并用x -射线等技术描绘出酶的三维结构。
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