(单词翻译:单击)
可可电台，每期节目一话题，让英语磨练耳朵的同时学到更多有益的小知识，丰富知识的同时受益于生活。
Some simple habits that help extend life
延长寿命的简单习惯
Go out
出去
Going outside, the skin will be exposed to sunlight, activates cells in the skin that produce vitamin D, a hormone that is essential for bone health and has a significant impact on the skin.
到户外去，皮肤会暴露在阳光下，激活皮肤中产生维生素D的细胞，维生素D是一种对骨骼健康至关重要的激素，对皮肤有很大的影响。
In fact it is estimated that about 50% of adults have low vitamin D levels for the simplest reason that they don't go out much; sitting near a window does not work because the glass door filters too much sunlight.
据估计，大约50%的成年人维生素D水平低最简单的原因就是他们不常出门;坐在窗户旁边是不行的，因为玻璃门过滤了太多的阳光。
【知识点讲解】
be essential for 对 ... 是必不可少的
例句：
Chromium has long been known to be essential for proper lipid and carbohydrate metabolism in mammals.
铬长期被认为是在哺乳动物体内相应的脂类和碳水化合物代谢所必需的.
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