钙是生成强壮骨骼的必须营养成分，并保持骨骼健康。
Calcium is an essential nutrient for building strong bones and keeping them healthy.
但是维生素是人们每天摄入的必须营养；没有办法在临床研究中全部去除它们来观察效果。
But vitamins are essential nutrients that people ingest in their daily diets; there is no way to withhold them altogether from research subjects.
可是，如果海面水温较高(例如在厄尔尼诺期间)，深层海水就无法上流，从而大大阻断了这些生命必须营养的正常循环。
However, when surface waters are warm (as during an el ni? O), they do not allow the colder, deeper currents to upwell and effectively block the flow of life-sustaining nutrients.
当海水表面温度下降时，较深一些的海水就会上浮，同时把这些必须营养成分带到水面处，供生活在那里的浮游植物生长的需要。
When surface waters are cold, deeper depths are allowed to upwell, bringing these essential nutrients toward the surface where the phytoplankton may use them.
你的血液细胞必须将营养传递给所有的其他细胞。
Your blood cells must deliver nutrients to all the other cells.
一个均衡的菜单必须包含好吃、营养丰富的食物。
A balanced menu must contain foods full of taste and nutrition.
重症急性胰腺炎病人处于高分解代谢状态，必须加强营养支持。
Patients with SAP have a hypermetabolic and hypercatabolic state. Nutritional support for patients with SAP is needed.
从传统的粮食援助转向食品与营养援助的更广泛的概念，必须成为这种“新政”的一项内容。
A shift from traditional food aid to a broader concept of food and nutrition assistance must be part of this New Deal.
为此，必须对家禽进行圈养，至少是一定程度上的圈养，所以需要满足其所有或大部分营养需求。
To achieve these, the birds must be at least partially confined, so need to be provided with all or most of their nutritional requirements.
在现行的法律下--1990年营养标签和教育行为--所有的包装食品必须用统一的版式标明营养成分和配方。
Under current law — the 1990 Nutrition Labeling and Education Act — all packaged foods must display nutrients and ingredients in a consistent format.
因此它们必须吃其它动物来满足这种营养需求。
They have to eat material from other animals to meet their nutritional needs.
要确保我们了解身体对于饮食的需求和反应，我们必须上一个“食品研究中的营养”的课程。
To make sure we know something about the body's requirements and reactions to diet, we have to take a "Nutrition in Food Studies" course.
例如，通过现金激励措施，可以提供一定程度的保护，尤其是在附加以下条件的情况下——父母必须重视孩子的健康和营养状况。
Cash incentives, for example, can provide a degree of protection, particularly if they come with the condition that parents look after the health and nutrition of their children.
食物日记你需要写；营养标签您需要阅读，评判和翻译；蛋白质，脂肪和碳水化合物你必须增加。
The food diaries you need to write; the nutrition labels you need to read and pronounce and translate; the protein, fat, and carbohydrate grams you have to add up.
国际粮食政策研究所的霍迪诺特·约翰说，以前失败的教训是，必须选择目标：集中在主要的营养素缺乏上面，集中在你可以做的最好的方面，主要针对婴儿。
John Hoddinott of IFPRI says the lesson of previous failures is that you have to select your targets: focus on the main deficiencies and on those for whom you can do most good, especially infants.
一个合理编列的课程表，犹如一个营养均衡的食谱，里面各个项目都是有益而必须的，不可偏废，不可再有选择。
A properly arranged school curriculum, like a cookbook on nutritionally well-balanced food, must include all the useful and indispensable courses — courses which are equally important and obligatory.
但营养必须在人们想吃的东西里面。
这是由于没有工业生产的化学物质的帮助，有机农场里的作物必须更努力的生长以保护自身。因此它们成熟后不会更有营养。
The idea is that, without help from industrial chemicals, plants on organic farms need to work harder to protect themselves. They end up becoming more nutritious as a result.
很明显，你不能在某人生病时让他绝食，但有些营养物对病人可有可无而对病原体却是必须的。
Obviously, you cannot stop feeding someone entirely when they are ill, but there might be nutrients which the patient could do without but the pathogen could not.
一个合理编列的课程表，犹如一个营养均衡的食谱，里面各个项目都是有益而必须的，不可偏废，不可再有选择。
A rationally arranged syllabus is like a nutritiously balanced recipe. Each item of the syllabus is beneficial and compulsory and can not be ignored. There is no room for other choices.
总的来说，Eck女士说，她的儿子有着营养的饮食，但在餐厅吃饭就很难做到，他们必须警惕的阅读食品标签。
Over all, Ms. Eck said, her son has a nutritious diet, but eating in restaurants is difficult, and they must vigilantly read food product labels.
给婴儿吃食品的质量是毋庸置疑的，婴儿食品必须是最佳的，营养价值要高并且无毒副作用。
There cannot be an iota of debate over the quality of food that has to be given to the baby. Needless to say, baby food has to be the best, containing high nutritional value and free of toxins.
英国营养基金会认为健康的饮食必须符合一下几点。
According the British Nutrition Foundation, the basis of a healthy diet is.
除了营养信息外，其他标识信息是蛋制品必须标示的。
In addition to nutrition information on consumer packages, other labeling information is required for egg products. All egg products must be labeled with.
除了营养信息外，其他标识信息是蛋制品必须标示的。
In addition to nutrition information on consumer packages, other labeling information is also required for egg products. All egg products must be labeled with.
欧盟委员会以及欧盟各成员国正在制定营养素规定，要求食品必须在达到一定营养水平后才能列明某些健康功效。
Nutrient profiles are being developed by the European Commission and EU Member States; these are the nutritional requirements that food products must meet to make certain health claims.
你若是个持证营养师那对此会很有争议。你可能认为这是在走极端。但你要取得极好的效果，就必须采取极端手段。
Quite controversial if you're a certified nutritionist. You might even deem it as extreme. But to get extreme results. Extreme measures must be taken.
你若是个持证营养师那对此会很有争议。你可能认为这是在走极端。但你要取得极好的效果，就必须采取极端手段。
Quite controversial if you're a certified nutritionist. You might even deem it as extreme. But to get extreme results. Extreme measures must be taken.
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