对...必不可少

This FCA labeled DNA probe is used to hybridize with the sample DNA sequence accumulated on the surface of a graphite electrode.

系统讨论了生物体内产生羟基自由基必不可少的Fe〓和H〓O〓的浓度对DNA损伤作用的影响，以及保温时间对DNA损伤作用的影响。

Since more and more soybean was imported into China, to establish rapid and accurate molecular detection methods to Phytophthora sojae are very important to soybean trade between China and other countries,also is necessary to control the propagation of Phytophthora root rot.

因此，建立大豆疫霉菌快速准确的分子检测方法，不仅对我国与其他国家的大豆贸易至关重要，而且对控制大豆疫霉病在我国的传播也是必不可少的。

Therefore, it is necessary for modern enterprises to supply reliable and real-time information and services by utilizing computer systems, more and more departments especially those pivotal departments have been unprecedentedly relied on computer systems, however, it is unavoidable for the hardware and software of a computer to have a breakdown, which may certainly results in unmeasured losses.

对现代企业来说，利用计算机系统来提供及时可靠的信息和服务是必不可少的，越来越多的行业、部门，尤其是关键部门，对计算机系统呈现出前所未有的依赖性。但是计算机的硬件和软件都不可避免地会发生故障，会带来无可估量的损失。

The most important of the factors affecting plant growth is that it requires the supply of water.

因为水对植物的生长产生最重要的影响，所以水对植物是必不可少的。

Mannose wire on the significance of modern nutrition is, as dietary fiber have been deemed no nutritional role of the waste, has been ignored until recent years a large number of clinical and epidemiological research on human dietary fiber found a very good balance of nutrition and regulating metabolism function, it is carbon water chemosynthetic of an important component of the human body is an essential nutrient.

甘露丝对现代营养学的意义在于，由于膳食纤维曾被当作没有任何营养作用的废物，一直不受重视，直到近年来大量的临床学和流行病学研究，发现膳食纤维对人体有很好的平衡营养和调节代谢的功能，它是碳水化合物的重要组成部分，是人体必不可少的营养素。

In nature, forest is resource-base, gene-base and power-base which take on the most perfect function. It is very important to maintain terrene environment and ecologic balance. Forest, as the provider of natural resource which is necessary to mankind development, take on significance to social sustainable development.

森林是自然界功能最完善的资源库、基因库、蓄水库和能源库，对维持陆地生态环境，维持生态平衡起着重要的作用，同时森林作为人类发展必不可少的重要自然资源提供者，对社会经济的可持续发展具有极其重要的意义。

County, whose continual use can be backdated to 2000 years ago, has made the great influence and effects on the administration of all the past dynasties, and has become an effective level indispensable to central government's administration and domination over locality.

县制产生至今已经有两千多年的历史，其长期沿用和稳定，对历代行政均产生了重大的影响和作用，是中央政府对地方实施有效管理和控制的一个必不可少的层次。

A few days from now, your horses, your diamonds and your shawls will be returned to you. You need them as much as life needs air.

几天以后，你的马匹、你的钻石和你的披肩都会归还给你，这些东西对你来说就像空气对生命一样是必不可少的。

Among the three constituents: Dex was essential and sufficient for the induction of aP2 gene expression, Ins synergized with the effect of Dex, whereas IBMX antagonized the aP2 induction by Dex or Dex plus Ins which was totally opposite to its action in adipocyte differentiation.

在它的三个组成成份中：Dex对诱导aP2基因的表达是必不可少的，Ins可以协同增强Dex的作用，而IBMX却拮抗Dex或Dex和Ins对aP2的诱导作用(IBMX的这一作用与其在脂肪细胞分化过程中的作用完全相反)。

Among the three constituents: Dex was essential and sufficient for the induction of aP2 gene expression, Ins synergized with the effect of Dex, whereas IBMX antagonized the aP2 induction by Dex or Dex plus Ins which was totally opposite to its action in adipocyte differentiation.

在它的三个组成成份中：Dex对诱导aPZ基因的表达是必不可少的，Ins可以协同增强Dex的作用，而IBMX却桔抗Dex或 Dex和Ins对aPZ的诱导作用（iMX的这一作用与其在脂肪细胞分化过程中的作用完全相反）。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。