必需的

Resonance Rayleigh light-scattering spectra of Zn2-4 with human serum albumin was studied in tris-HCl medium.

1前言锌是人体必需的微量元素，其含量的测定是卫生检验的一项日常工作。

The cutting edge along the side of an end mill is generally straight and sometimes can be tapered by grinding on a tool and cutter grinder such that the draft required for mould and die cavities can be automatically generated.

最尖端沿立铣床的边通常是平直的和可以通过研有时逐渐变细在工具，并且切削刀研磨机这样对于模子是必需的草稿和死洞可以自动地引起。

Further study to investigate the difference of propofol pharmacokinetics between Chinese and non-Chinese elderly patients is necessary.

对於propofol药物动力学在华人以及非华人老年病患的差异，进一步的研究是必需的。

Providing all essential nutrients to insure daily intake of nutrients including wholefood concentrates for 'picky' eaters, vegetarian and vegan children.

提供所有必需的营养素，以保证每日摄取的营养素包括wholefood集中'挑剔'吃，素食和素食主义的儿童。

From a shot-chucking triggerman to someone that will rebound, defend; distribute all while still getting his requisite 20-plus a night, usually in a win.

从一个只会使出致命投篮的球场刺客到现在篮板、防守皆能；纵使他把心思用在更多不同的方面，但他仍旧能够每晚砍下必需的20+分，而且经常是赢球。

There is a wealth of organic acids, terpenoid substances, vitamins, enzymes, polysaccharides, such as biological and pharmacological activity of natural ingredients.

澳洲蜂胶富含有20大类、380多种天然成分，包括30多种人体必需的微量元素、20多种氨基酸、数10种芳香化合物、30多种黄酮类物质，还有丰富的有机酸、萜烯类物质、维生素、酶类、多糖等具有生物学和药理学活性的天然成分。

A telomere is at each end of a chromosome. Telomeres are necessary for a cell to divide.

端粒位于每个染色体的末端，对细胞的分裂是必需的。

Eric Noll, executive vice president of Nasdaq OMX, said:"Despite our best efforts, the increasingly competitive nature of the MTF space in Europe has meant that the growth of the business hasn't reached levels necessary for us to realise our stated objectives."

纳斯达克OMX执行副总裁埃里克·诺尔表示：&尽管我们竭尽所能，但欧洲多边交易设施市场竞争日益激烈的特性意味着，该业务的增长没有达到使我们实现既定目标所必需的水平。&

Skimmers are not necessary for systems our size, though they can allow for a more lax maintenance routine. I say this because I ran my system for 3 years without one, and haven't seen enough change for the better since adding it. In fact, it has created new problems that may lead to its removal.

在这样的一个小缸，化蛋器并不是必需的，他们可以让我们维护更少一些，但是，3年以来，我没有化蛋器，一直也很好，即使后来加了化蛋，也感觉不到什么效果，反而化蛋有可能带来一些新的问题

A good many IC techniques are only necessary because it is difficult to make precise and linear IC resistors.

许多集成电路技术是唯一必需的，因为做准确而线性的集成电路电阻是很困难的。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。