选择性的

The main content of this paper as follows: The acidic strength, reaction temperature, reaction time of Chlorine-aluminate Ionic Liquids with different structure of cation on the activity of transalkylation of MN with TeMB and the selectivity of 2,6-DMN were studied. The optimum reaction condition was obtained: the molar fraction of AlCl_3 is 0.71, molar ratio of 2-MN and TeMB is 1, the amount of ionic liquid is 32wt%, reaction temperature is 20℃and reaction time is 8h using X-xAlCl_3 and X-xAlCl_3 as catalysts; the optimum reaction time is shortened 6h using Et_3NHCl-xAlCl_3 as catalyst.

本文主要研究了以下内容：分别考察了不同阳离子结构的氯铝酸盐类离子液体的酸强度、反应温度、反应时间等因素对MN和TeMB转移烷基化的催化反应活性和2，6-DMN选择性的影响，优化得到适宜的反应条件为：以X-xAlCl_3和X-xAlCl_3为催化剂时，AlCl_3的摩尔分数x=0.71，2-MN和TeMB摩尔比为1∶1，离子液体用量为32wt％，反应温度为20℃，反应时间为8h；以Et_3NHCl-xAlCl_3为催化剂时，反应时间缩短到6h。

Alice's Adventures in Wonderland by Lewis Carroll is world-famous by its odd plots and unusual language.

强调译者应以读者的角度出发，选择适当的翻译方法和策略，从原文所提供的多源信息中进行选择性的翻译，以实现翻译的目的。

In frail older patients with multiple-system disease, the chronic use of traditional nonselective NSAIDs is associated with an unacceptable rate of life-threatening gastrointestinal bleeding.

对於患有多种疾病的老年患者，如果长期使用传统的非选择性的NSAIDs，将有可能使会导致生命危险的胃肠道出血的出现的机会增加。

According to a study in the journal Neuron this week, researchers genetically manipulated the brains of mice to overproduce a key enzyme that appeared to selectively wipe memories from the animals' brains.

根据一项本周发布在《神经元》期刊上的研究，研究者们遗传性的操控老鼠的大脑来使之过度产生一种关键酶，这种酶看来能选择性的擦除老鼠脑中的记忆。

But this time investors are more cautious, this time is the process of differentiation would be more selective investment fund managers, if you have a very good performance, the money more easily, if not so good performance of the money much smaller probability than before.

但是，这一次投资者更加谨慎，这时候是分化的进程将更有选择性的投资基金经理，如果你有很好的表现，钱更容易，如果不是那么好表现的钱比以前少得多的概率。

During the reaction,the bromide component has been converted to catalytically inactive benzylic bromide.In pure acetic acid medium,the "catalyst failure" occurs owing to the formation of benzylic bromide while in acetic acid-water medium,the solvolysis of benzylic bromide by water maintains the catalytic activity to some extent.

反应过程中溴组分会转变为无活性的苄溴，在纯醋酸溶剂中，催化剂会因苄溴的形成而发生催化剂失活现象；在醋酸-水混合溶剂中，由于水对苄溴的溶剂化作用会使苄溴还原为溴离子，一定程度上保持了催化剂活性；并且在一定范围内，含水量的提高有益于生成醛选择性的提高，研究表明，将混合溶剂的初始含水量控制在5-10wt。

This portrait-gallery of old Etonians is very select: preeminent distinction of birth or merit may win you a place there, or again official connection with the school, which right loves to keep up an unbroken panorama of its teachers, and to vivify its annals with the faces and figures of the personalities who carried on its traditions.

这座旧伊顿人的肖像画廊，是非常选择性的：卓越的出生或优越，也许能让你获得一席之地，或与学校领事席有着密切关系，他们非常热衷于保存教师的完整全映，并让其史册清晰的充满，饱含传统的面孔和性格。

In order to develop an useful synthestic process, we have synthesized amides with various substitutents. The isoquinoline skeleton was constructed through Bischler-Napieralski reaction, followed by asymmetric reduction of the imine intermediates with a Ru complex to form the only chiral center. Finally, we connected the two phenyl groups by Heck reaction and effectively obtained optically active aporphine alkaloids.

为了发展一套实用的合成方法，我们首先制备於苯环上具有不同种取代基的苯乙醯胺，接著透过Bischler-Napieralski反应进行分子内合环，并利用钌金属对亚胺中间体进行不对称的还原反应，建立出产物中唯一的光学活性中心，最后再利用Heck反应连结两个苯环，就可以顺利得到具有光学选择性的阿朴吩类天然物。

chronic filariasis,especially filarial chyluria,hemotochyluria,lymphedemais still the serious clinical problems.efforts have been made in treatment of the filariasis by researchers at home and abroad but no ideal method is available.new advance in therapeutic research has been made in recent years.in this article the advance in treatment of filariasis with physical,traditional chinese medicine and western medicine,surgery and gene therapy were discussed and the results were compared as well.

慢性丝虫病尤其是丝虫性乳糜尿、乳糜血尿、淋巴水肿等慢性疾病，迄今仍是临床上的几大难题，以往，国内外学者虽对上述疾病进行多方面治疗研究，但仍无理想的治疗方法。近年对上述疾病的治疗研究有了新的进展。本文选择性的阐述了对慢性丝虫病物理、中西药、外科手术和基因治疗等研究进展情况。分析比较了各种疗法的治疗效果。

We have procceeded protecting liver and decreased enzyme experiments on compound components extracted from the root of Cichorium glandulosum Boiss.et Huet.

进行了研究，对毛菊苣根中提取的某些部位有选择性的进行了保肝降酶的药效学试验，并制定了其根和果实的药材标准，为今后维吾尔药的临床应用奠定了理论基础。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。