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。
She said that the use of sun creams and moisturisers with a sun protection factor also reduces UV absorption and so vitamin D production.
她说，使用含有防晒因子的防晒霜和保湿露也能减少紫外线的吸收和维生素D的合成。
METHOD:To separate and purify by D-101 macroporous resin and to determine the quality of dexamethasone acetate by UV spectrophotometry.
方法：采用D-101大孔树脂分离纯化、紫外分光光度法测定皮炎宁中醋酸地塞米松的含量。
The 2-d simulation of thick SU-8 photoresist profile after UV lithography is presented.
这篇论文是厚su - 8光刻胶接触式UV光刻后形貌的两维模拟。
Strain ZG-24, with high D-xylose reductase activity, was obtained by UV repeated mutation and selection with high xylose concentration plate.
以此为出发菌株，通过UV重复诱变，并结合高糖平板分离，得到木糖还原酶活力较高的较佳诱变株ZG - 24。
The degree of deacetylation of chitosan was determined directly by 1st derivative UV spectrophotometry using hydrochloric acid as solvent and N acetyl D glucosamine (ACGLSM) as standard.
以盐酸为溶剂，N乙酰基D葡萄糖胺为标准品，用紫外一阶导数光度法直接测定壳聚糖的脱乙酰度。
UV disinfection was the best proposal of drinking water second disinfecting, because of its high efficiency, safety and economy; D…
认为紫外线灭菌具有高效、安全、经济等特点，可作为饮用水二次消毒首选方案；
UV disinfection was the best proposal of drinking water second disinfecting, because of its high efficiency, safety and economy; D…
认为紫外线灭菌具有高效、安全、经济等特点，可作为饮用水二次消毒首选方案；
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