应时的

In studying the linear response of the dressed quark propagator in the presence of the variable external field, we derive a general expression for the vacuum susceptibility, based on the two-point external field formula in the Quantum Chromodynamical sum rule. The expressions we have derived for the calculation of vacuum susceptibility are model independent. Then we use the expressions to calculate the renormalised axial vector, vector and tensor vacuum susceptibilities.

接下来在研究夸克传播子在外场中的线性响应时，我们利用QCD求和规则两点外场公式推导出了一般的计算真空磁化率的公式（以变化的轴矢量外场为例），我们这里推导出的真空磁化率的计算公式是模型无关的。

In our research on study chemical reaction of active methylene compounds and brom-acetophenone. Because of brom-acetophenone is compound that contain carbonyl and halogen ,which will take place electrophilic substitution and nucleophilic addition. When active methylene compounds are ethyl acetoacetate and β-diketone, controlling reaction condition, we have found that mono-substitution's production and di-substitution's. production is isolated; active methylene compounds are acetoacetanilide and acetoacetanilide derivate, pyrrolidin-2-one derivants were obtained by substitution and close-ring reaction .but there is no report about it.

本文是让活泼亚甲基类化合物与溴代苯乙酮发生化学反应，由于溴代苯乙酮是含有羰基的卤代烃结构，它可以发生亲电取代和亲核加成反应，当活泼亚甲基类化合物为乙酰乙酸乙酯和β-二酮时，控制反应条件可以发生单取代和双取代两种产物；当活泼亚甲基类化合物为乙酰乙酰芳胺类化合物来反应时，溴代苯乙酮中的羰基与氨基会发生分子内的关环反应生成吡咯烷-2-酮衍生物，这在以前的研究中是没有发现的。

Advances in the catalysts for synthesis of ethylene glycol ethers via etherification were reviewed, and some suggestion were made for development of new catalysts.

介绍了醚化反应法合成乙二醇醚催化剂的研究进展，并对催化剂的开发提出了建议。在进行环氧乙烷与醇的醚化反应时，使用传统的碱性催化剂，反应容易形成多醚；使用传统的酸性催化剂，反应容易形成有毒物质二烷。

It is found that the effects made by gravitation is so small that can be ignored in observation.

但是这两种情况下的改变量的数量级都很小，因此得出结论：在目前的实验条件下，对于检验光的真空色散效应时，引力场造成的影响是完全可以忽略的。

What we're finding in insects is that they become obese when parasites cause inflammation that affects metabolism," said Marden."That seems akin to what's happening in humans when they get type-2 diabetes. It's not because there's been a change in the genetic composition of the population. it's because something has changed in our enironment.

我们发现的是当昆虫体内的寄生虫触发可以影响代谢的炎症反应时，昆虫发胖了" Marden说，"患有2型糖尿病的人似乎与这种发现相似，并不是人群中的遗传组成发生了改变，而是体内环境发生了改变。

When used to explore the effect of an increase in atmospheric greenhouse gases on the climate these models, which have been developed by different teams, all predict more warming than greenhouse gases and water-vapour feedback can supply unaided.

当云的效应被纳入探讨大气的温室效应时，不同研究团队所开发的模式，比起只考虑温室气体和水气反馈的效应，一致预测了较多的变暖。

But under the same conditions, the reactions of the complex (41) with organic lithium reagents give a kind of novel complexes in which the nucleophile is added to the a-carbon of the phthalazine ring.

然而含有桥羰基的2，3-二氮杂萘配位的羰基双铁络合物4l在相同的条件下与芳基锂试剂反应时，芳基锂却是亲核加成在氮杂环的α位羰上，生成一类结构独特的双氮双铁羰基络合物。

DHCC Constance in the chemistry belongs to the onlighted Cyclopentanoperhydrophenanthrene when it reacted together with the acid Constance it could transform into the fluorescence phenol.we did the flouric determination for the DHCC, in which treated by the ethanol-sulfuric acid or acetic anhydride-methylene chloride-sulfuric acid, acquired standard curve in the 0-40μg/ml presented the liner relet...

DHCC类物质在化学上属于不发光的环戎烷多氢菲类，但与酸性物质一起反应时，可转化为产生荧光的酚类。用乙醇硫—酸或乙酸酐—二氯甲烷—硫酸处理后的DHCC进行荧光检测，获得标准曲线0—40μg/ml范围内呈线性关系，检出的最高灵敏度可达300ng/ml。该方法可用于分离后的DHCC及单一种DHCC代谢物的定性及定量分析。

By the ways of documentation,expert interview,statistics and experiment,and applying the relative theories of sports training and sports physiology,training,test and analysis were arranged on the choice reaction time of Shanghai amateur women foil fencers.

采用文献资料法、专家访谈法、数理统计法和实验法等方法，运用运动训练学、运动生理学等相关理论，对上海女子花剑队三线运动员的选择反应时进行训练、测量和分析，从而验证一些反应时的专门训练方法是否能短时间内缩短花剑运动员的选择反应时，提高运动员反应速度，为更好的促进上海女子花剑的发展提供条件。

But when there is a psychological response to the tree, the response is a conditioned response, it is the response of past memory, past experiences, and the response is a division in relationship.

但是当对树产生心理反应时，那反应就是局限的反应，那反应来源于过去的记忆、过去的经验，这反应就变成关系中的分裂。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷