| 单词 | 必需 |
| 释义 | 〔necessary〕Needed to achieve a certain result or effect; requisite:必不可少的：达到某种目的而必需具备的；必要的：〔phenylalanine〕An essential amino acid, C6H 5CH 2CH(NH 2)COOH, that occurs as a constituent of many proteins and is normally converted to tyrosine in the human body. It is necessary for growth in infants and for nitrogen equilibrium in adults. 苯丙氨酸：一种基本的氨基酸，C6H 5CH 2CH(NH 2)COOH，是许多蛋白质的组成成分，通常在人体内常转变为酪氨酸。它是婴儿成长和成人的氮平衡所必需的 〔water〕A clear, colorless, odorless, and tasteless liquid, H2O, essential for most plant and animal life and the most widely used of all solvents. Freezing point 0°C (32°F); boiling point 100°C (212°F); specific gravity (4°C) 1.0000; weight per gallon (15°C) 8.337 pounds (3.772 kilograms). 水：清洁、无色、无嗅、无味的液体，H2O，为绝大部分植物和动物生命所必需，广泛用于所有的溶剂。冰点为零摄氏度(32华氏度）；沸点为100摄氏度(212华氏度）；标准密度为(4摄氏度）1.0000；每加仑(15摄氏度）重8.337磅(3.772公斤） 〔building〕"The essential thing in a building . . . is that it be strongly built, and fit for its uses" (John Ruskin). “最必需的事是一幢房子…建筑牢固而且适于使用的房子” （约翰·拉斯金）。〔room〕needed elbowroom to negotiate effectively;进行有效谈判所必需的时机；〔deficiency〕A lack or shortage, especially of something essential to health; an insufficiency:缺乏，缺少：不足，尤指对健康十分必需的东西；不够：〔avitaminosis〕A disease, such as scurvy, beriberi, or pellagra, caused by deficiency of one or more essential vitamins.维生素缺乏症：一种因缺乏一种或多种必需的维生素而形成的疾病，如坏血病、脚气病、糙皮病等〔lysine〕An essential amino acid, C6H 14N 2O 2, derived from the hydrolysis of proteins and required by the body for optimum growth. 赖氨酸：一种重要的氨基酸，C6H 14N 2O 2，可以从水解蛋白中得到，是身体能最佳发育所必需的 〔minyan〕A minimum of ten Jews or, among the Orthodox, Jewish men required for a communal religious service.法定人数：在犹太正教中举行公众宗教仪式所必需的最少为十名的犹太人〔necessarily〕Of necessity; inevitably.必然：必需地，不可避免地〔necessity〕Something necessary:必需品：必需的东西：〔defect〕The lack of something necessary or desirable for completion or perfection; deficiency:瑕疵，毛病：缺少圆满或完善所必需的某物，缺点，缺陷：〔oxygen〕A nonmetallic element constituting 21 percent of the atmosphere by volume that occurs as a diatomic gas, O2, and in many compounds such as water and iron ore. It combines with most elements, is essential for plant and animal respiration, and is required for nearly all combustion. Atomic number 8; atomic weight 15.9994; melting point -218.4°C; boiling point -183.0°C; gas density at 0°C 1.429 grams per liter; valence 2. See table at element 氧：一种非金属元素，按体积算占空气的21%，它是一种双原子气体O2，存在于许多化合物如水和铁矿物中。它与许多元素化合，对植物和动物呼吸是根本必需的，几乎所有的燃烧都要求有氧。原子序数是8；原子量是15.9994；熔点是-218.4°C；沸点是-183.0°C；气体密度是0°C时一升为1.429克； 原子价是2 参见 element〔vital〕Necessary to the continuation of life; life-sustaining:生命延续所必需的；维持生命的：〔sap〕An essential bodily fluid.体液：体内所必需的液体〔decency〕Surroundings or services deemed necessary for an acceptable standard of living.舒适环境，舒适服务：舒适生活所必需的环境或服务〔chromosome〕A circular strand of DNA in bacteria and cyanobacteria that contains the hereditary information necessary for cell life.染色体：细菌和含氰细菌中的环形DNA链，含有细胞生命必需的遗传信息〔equip〕To furnish with the qualities necessary for performance:准备，训练：使之具备某种行为所必需的品质：〔base〕Groundwork is most often applied figuratively, in the sense of a necessary preliminary: Groundwork 最常用作比喻，表示必需的开端： 〔budget〕needed help budgeting our income; budgeted my time wisely.必需帮助预算我们的收入；明智地安排我的时间〔surplus〕Being more than or in excess of what is needed or required:过剩的：比需要的或必需的更多或过多的：〔cost〕The expenditure of something, such as time or labor, necessary for the attainment of a goal.See Synonyms at price 成本：某物的花费，例如时间或劳动，是为达到某一目的而必需的 参见 price〔threonine〕A colorless crystalline amino acid, C4H 9NO 3, that is derived from the hydrolysis of protein and is an essential component of human nutrition. 苏氨酸：一种由蛋白质水解而成的无色晶状氨基酸C4H 9NO 3，是人类必需的营养成分 〔protein〕Any of a group of complex organic macromolecules that contain carbon, hydrogen, oxygen, nitrogen, and usually sulfur and are composed of one or more chains of amino acids. Proteins are fundamental components of all living cells and include many substances, such as enzymes, hormones, and antibodies, that are necessary for the proper functioning of an organism. They are essential in the diet of animals for the growth and repair of tissue and can be obtained from foods such as meat, fish, eggs, milk, and legumes.蛋白质：一种复杂的有机体大分子的组合，含有碳、氢、氧、氮，通常还有硫，由一个或多个氨基酸链构成蛋白质，是所有生命细胞的基本组成部分，它包含许多物质，比如酶、荷尔蒙和抗体，这些物质都是有机体正常活动所必需的，蛋白质是动物膳食的必需成份，对成长和组织发育至关重要，它可从肉类鱼、鸡蛋、牛奶和豆类食品中的摄取〔lifeline〕A means or route by which necessary supplies are transported.重要的交通线：必需物资运输的方法或路线〔necessitous〕from Old French [necessary] 源自 古法语 [必需的] 〔metabolism〕The complex of physical and chemical processes occurring within a living cell or organism that are necessary for the maintenance of life. In metabolism some substances are broken down to yield energy for vital processes while other substances, necessary for life, are synthesized.新陈代谢：维持生命所必需的，发生于存活细胞中或生物体中的物理和化学过程的总和。在此过程中，一些物质被分解从而为生命过程提供能量，而另一些维持生命所必需的物质则被合成〔coercivity〕The intensity of the magnetic field needed to reduce the magnetization of a ferromagnetic material to zero after it has reached saturation.矫顽力：磁场的强度，为在强磁性的物质达到饱和之后，把它的磁化作用缩小到零所必需〔obbligato〕An obbligato accompaniment.助奏：必需的伴奏〔push〕At a point when or if all else has been taken into account and matters must be confronted, one way or another:在紧要关头：在如果或当任何其他因素都被考虑到了和所有事实都必需面对的时刻，不是以这种方式就是另一种方式：〔bread〕Food in general, regarded as necessary for sustaining life:食物：泛指维持生命所必需的食物：〔involve〕To have as a necessary feature or consequence; entail:伴随，连同：作为必需特色和影响而拥有；伴随：〔lebensraum〕Additional territory deemed necessary to a nation, especially Nazi Germany, for its continued existence or economic well-being.生存空间：被认为对一民族，尤指纳粹德国的继续生存或经济富足所必需的额外领土〔component〕Any of the minimum number of substances required to specify completely the composition of all phases of a chemical system.组分：任一能完全区分各种化学系统所有构成成分所必需的最少量物质〔supergun〕An extremely large, cannonlike gun designed to shoot projectiles over long distances or to launch satellites and spacecraft into orbit without a propulsion or guidance system, as is needed with a missile.巨型炮：似火炮的超大型大炮，用来发射远程火箭，或者将卫星和宇宙飞船送入天体轨道，无需发射导弹所必需的推进或导航系统〔hide〕An old English measure of land, usually the amount held adequate for one free family and its dependents.海得：旧的英国土地测量单位，一般指赡养一家自由农民所必需的土地〔privation〕Lack of the basic necessities or comforts of life.匮乏：缺乏生存必需的东西或生活的舒适〔Donatist〕A member of a rigorist, schismatic Christian sect, strongly opposed by Saint Augustine, that arose in North Africa in the fourth centurya.d. and believed in sanctity as requisite for church membership and administration of all sacraments. 多纳图斯派：宗教严格主义者，主张分裂的基督教派，受到圣·奥古斯汀强烈反对，公元 4世纪于北非兴起，认为圣洁是成为教会成员和圣事的施行的必需条件 〔equipment〕The central meaning shared by these nouns is "the materials needed for a purpose such as a task or a journey": 这些名词所共有的一个中心意思是“某一目的，如一项任务、一次旅行所必需的材料”： 〔complete〕"Give us the tools, and we will finish the job" (Winston S. Churchill).Often, though, it suggests the addition of final details to what has already essentially been completed: “给我们工具，我们就会干完这些工作” （温斯顿·S·丘吉尔）。不过，它又常暗示着必需完成的另外一些细节： |
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