给定元素的所有同位素都含有相同的质子数，但它们的中子数不同，因此它们的原子质量也不同。
All the isotopes of a given element have the same number of protons, but differ in their number of neutrons, and hence in their atomic mass.
坚果和种子是维生素E的良好来源。
新鲜的水果和蔬菜提供纤维素和多种维生素。
为确保孩子们营养充足，通常推荐使用维生素滴剂。
To make sure the children are well nourished, vitamin drops are usually recommended.
鸡蛋和油性鱼等食物都富含维生素D。
当然，多种维生素并不能代替锻炼和均衡饮食。
Multivitamins are no substitute for exercise and a balanced diet, of course.
多糖是复杂的碳水化合物，包括淀粉、糖原和纤维素。
The polysaccharides are the complex carbohydrates, including starch, glycogen, and cellulose.
番茄红素是脂溶性的，必须和一定量的脂肪一起食用才能被身体吸收。
Lycopene is fat soluble and must be consumed with a certain amount of fat to be absorbed by the body.
从这个角度来看，衰老本身可能是可以治疗的，就像治疗高血压或维生素缺乏症那样。
In that light, aging itself might be seen as something treatable, the way you would treat high blood pressure or a vitamin deficiency.
红鹮和火烈鸟一样，吃一些甲壳类动物，在体内生成胡萝卜素，就形成了它鲜艳的颜色。
The scarlet ibis, like the flamingo, gains its vibrant color from carotene derived from a diet of crustaceans.
吉本斯解释：“这就像一个不需要淀粉或者纤维素就能生产出生物燃料分子的小型工厂。”
"They are like little factories that spit out biofuel molecules without the need for starch or cellulose, " explains Gibbons.
大部分蛋白质存在于蛋清中，而维生素、矿物质、脂肪、类胡萝卜素和胆固醇则存在于蛋黄中。
Most of the protein is contained in the egg white, while vitamins, minerals, fats, carotenoids and cholesterol are contained in the yolk.
尽管复合维生素的益处还远未得到证实，但你花几美元在复合维生素上可能是一项不错的投资。
Although proof of the benefits of multivitamins is still far from certain, the few dollars you spend on them is probably a good investment.
非洲人现在同样热衷于亚洲药物：青蒿素，一种从中国灌木中提取的、非常有效的治疗疟疾的药物。
Africans are now just as keen on Asian medicine: artemisinin, a highly effective malaria remedy derived from a Chinese shrub.
该计划成功的机会很大，因为红薯是该地区的主食和主要农产品，而且目前种植的品种几乎不含胡萝卜素。
The plan has good chances of success, since sweet potato is a staple of the region's diet and agriculture, and the varieties currently grown contain little beta-carotene.
英国一项研究，调查了1600名年轻人的早餐习惯后发现，那些经常吃早餐的人摄入了更多纤维和微量营养素。
In one study on the breakfast habits of 1,600 young people in the UK, researchers found that the fibre and micronutrient intake was better in those who had breakfast regularly.
这些维生素能预防某些疾病。
研究表明，吃肉较多的人可以通过转向纯素饮食将食物相关的生态足迹减少三分之一或更多。
Studies have shown that people who eat a meat-heavy diet can reduce their food-related footprint by one third or more by moving to a vegan diet.
“多亏了我的志愿者老师，我的生活改变了很多。我会努力学习，成为像她一样优秀的人，”当地学生李素梅兴奋地说。
"Thanks to my volunteer teacher, my life has changed a lot. I will study hard and become an excellent person like her," Li Sumei, a local student, says excitedly.
著名科学家亚历山大·弗莱明曾说：“当我在1928年9月28日破晓后醒来时，我当然没有打算通过发现世界上第一种抗生素给所有医药带来改变。但我想这正是我当时所做的。”
The famous scientist Alexander Fleming said, "When I woke up just after daybreak on 28th September 1928, I certainly didn't plan to revolutionize all medicine by discovering the world's first antibiotic. But I guess that was exactly what I did."
听同位素讲述行星起源的故事。
鸡素烧是日本料理的代表之一。
大笑应该像每天一片的维生素。
只是用清水冲洗干净并加一点点护发素。
小君：嘿，我们在庙会庆典时也会准备素肉。
我们都需要维生素d，它可以通过光照获取。
We all need vitamin d, which is a nutrient that can be obtained by catching some rays.
你一定是生长素，因为你让我的茎迅速的延长。
You must be auxin, cause you are causing me to have rapid stem elongation.
人类母乳中含有新生儿所需的维生素和矿物质。
Human breast milk naturally contains the vitamins and minerals a newborn requires.
科学家们利用这些三维模型来研制新的抗生素。
The models are used by scientists to develop new antibiotics.
当然，所有的水果都富含营养素，都可以有助健康。
Sure. All fruits are loaded with nutrients that are building blocks to good health.
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