必需的

Copper is one of the essential microelements for plants. But in recent years, the abuse of copper bactericide and industrial pollution has led to the increase of copper content in environment such as in soil.

铜是一种高等植物生长发育过程中必需的重要微量营养元素，是许多胞内酶所必需的组分或辅酶，它参与很多生理代谢过程，对作物的发育、品质、产量等有重要的影响。

In 1931, the Wisconsin research team proved the mammal nutrition must the third kind of element is the zinc; in 1961 Ananda S, Prasad and so on reported that "Iranian village sickness", has the short, the reproductive organ maldevelopment, to lack the iron liver splenomegaly, low-spirited, to be addicted to rests and so on sickness, the zinc treatment has the good effect; Various countries also one after another have the zinc denutrition the report which confirmed after the experiment, and discovered that the zinc medicinal preparation treats enteropathy extremity dermatitis to have the special effect.

锌为人体必需的微量元素之一，其作用巨大，正引起社会各界的日益重视，被近代医学界、营养学界喻为人体的"生命之花"、"智慧元素"。1931年，威斯康星研究小组证明哺乳动物营养所必需的第三种元素是锌；1961年Ananda S，Prasad等报告"伊朗乡村病"，有身材矮小、生殖器官发育不良、缺铁性肝脾肿大、精神不振、嗜睡等症，锌治疗有良效；各国也陆续有锌营养缺乏经实验证实的报道，并发现锌剂治疗肠病性肢端皮炎有特效。20世纪70年代末以后，我国各地有大量关于锌缺乏病的报道，以小儿为多见。

While, however, we persist in believing that a poet ought to know as much as will not encroach upon his necessary receptivity and necessary laziness, it is not desirable to confine knowledge to whatever can be put into a useful shape for examinations, drawing-rooms, or the still more pretentious modes of publicity.

但不论如何，我们坚持相信，一个诗人应该知道的越多越好，只要不妨害他必需的感受力和必需的懒散，而那种将知识的作用仅仅局限于应付考试、客厅闲谈或者当众炫耀自夸的观点是不足取的。

While, however, we persist in believing that a poet ought to know as much as will not encroach upon hisnecessary receptivity and necessary laziness, it is not desirable to confine knowledge to whatever can be put into a useful shape for examinations, drawing-rooms, or the still more pretentious modes of

可是，我们虽然坚信诗人应该知道得愈多愈好，只要不妨害他必需的感受性和必需的懒散性，如把知识仅限于用来应付考试，客厅应酬，当众炫耀的种执那就不足取了。

Your transcendence is necessary beloved, necessary to the ascension of Earth.

你的超越是必需的，至爱的人类，对地球的提升是必需的。

That is, it is absolutely necessary when you drive a car, to think, or it may be instinctual, but you have thought of it, to learn a language, to play the piano, to do your business, to do whatever you do, thought is necessary.

那就是，当你驾驶一辆车的时候它是绝对必需的，去想，或者它或许是本能的，但是你已经考虑过它了，去学一门语言，去弹钢琴，去做你的生意，去做无论你做的什么，思想是必需的。

The former is necessary for equilibrium-controlled synthesis of peptide bonds while the latter is necessary for kinetically controlled synthesis of peptide bonds.

酰胺酶活性起水解或合成肽键的作用，因而对平衡控制的肽键合成是必需的；酯酶活性起转移酰基的作用，因而对动力学控制的肽键合成是必需的。

With the help of RP-HPLC, the hydrolyzes of corn gluten meal were found to be rich in Pro and basic amino acid, such as Phe and Leu, which can be used as food additives to supply basic amino acid and to lower blood pressure.

利用反相高效液相色谱法对玉米黄粉蛋白酶解产物的氨基酸组成进行了测定，发现酶解产物中含有大量的Phe(Phenylalanine，苯丙氨酸)，Leu(Leucine，亮氨酸)等必需氨基酸和Pro(Proline，脯氨酸)，他们可以添加到食品中来补充必需的氨基酸和降低高血压患者的血压，对综合开发利用这一丰富的农副产品具有重要的意义。

Who shall be responsible for the aftermaths of insufficient capital investment necessary for safe production.

第十八条生产经营单位应当具备的安全生产条件所必需的资金投入，由生产经营单位的决策机构、主要负责人或者个人经营的投资人予以保证，并对由于安全生产所必需的资金投入不足导致的后果承担责任。

Linoleic acid is an essential fatty acid, lack of essential fatty acids, all human system there will be abnormal.

亚油酸是人体必需的脂肪酸，如果缺乏必需的脂肪酸，人体所有系统均会出现异常。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。