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By adopting novel Pummerer-cyanation route and by using thionyl chloride as S-transfer reagent, the first thieno [3,4-c] thiophene bearing all electron withdrawing groups has been synthesized.

设计采用新颖的Pummerer-氰化路线和用亚硫酰氯作S-转移试剂的路线合成了第一例全部连吸电子基的噻吩并[3，4-c]噻吩。

This type of sprue puller works on the principle of withdrawing the sprue puller through a plate, such as a stripper plate or an underfeed floating cavity plate, in order to eject the feed system.

这种类型的主流道拉料是根据主流道拉料杆从一块模板上抽出的原理来顶出浇注系统的。这块模板可以是卸料板或是一块下进料式浮动型腔板。

Besides, with the withdrawing of American and Russian influence, the power-vacuum brings the feeling of unsafety in this area, this is why Singapore had to make changes in her foreign policies in order to fit the current situation in a more pragmatic and flexible way.

此外随著美、苏势力的撤出，此区域权力真空下所带给新加坡的不安全感，都让星国不得不以更弹性的外交手段面对这些情势的变化，让新加坡在外交政策上变得更弹性务实。

Caution: When withdrawing gas from the container, the capacity of the internal vaporizer can be exceeded.

警告：当从容器中提取气体时，可能会超过内部蒸发器的能力。

UV-5S3A---is equipped with powder remover unit,remote-infrared rendering machine unit,UItraviolet five-roller varnisher unit,and automatic feeding and withdrawing paper device.

UV-5S3A---配除粉机组，远红打底机组，紫外光五辊上光机组，三机头及自动送纸，自动收纸生产线。

It should include the functions of booking room, quarter registering and modifing of the room informationmainly, the query of the room information, withdrawing the room and check-out, stating the turnover and the use of the room. It can deal with all kinds of information of the rummery.

一个良好实用的酒店客房管理系统应该能够对酒店进行全方位的管理，其主要功能应包括客房预订，住宿登记，客房信息修改，客房查询，退房结，统计营业额和客房使用率，以满足对酒店信息的各种处理。

He chastises Levin for withdrawing from the zemstvo, where he might have exerted a positive impact.

他斯菲尔文的退出 zemstvo ，在那里他有可能施加积极的影响。

We hope that the formation of biazulene compound(201), under the coupling reaction of 1、3-position being along with electron-withdrawing group, 2-position being along with hydroxy group, and four 4、8-position being along with static energy obstacle large enough functional group of azulene compound(200), may have the chiral auxiliary effect like that of the BINOL.

希望将两个在1、3-位置上有拉电子基、2-位置上有羟基及在4、8-位置上有立体能障够大的官能基之薁类化合物(200)，进行偶合反应后所形成的双薁类化合物(201)能够像BINOL那样具有掌性辅助剂之效果。

The results have indicated that the introduction of electron-donating methoxy or electron-withdrawing cyano-group at the 7-position of 3-phenylcoumarins caused a bathochromic shift for both absorption and fluorescence spectra. The phenyl group at the 4-position derivative has a hypsochromic shift for both absorption and fluorescence spectra.

结果发现，在3-苯基香豆素的7-位引入给电子基团甲氧基或吸电子基团氰基均使它们的吸收光谱和荧光光谱产生红移，4-苯基香豆素的衍生物的吸收光谱和荧光光谱均产生蓝移。3-苯基香豆素衍生物与4-苯基香豆素的衍生物的基态和激发态的电子转移方向相反。

The bay area has no substituent and has electron-withdrawing groups,such as bromine atom,cyano-group and 4-formyl phenoxy group compounds have strong absorption in 525 nm,when excitated them,they have strong yellow and salmon pink luminescence bettwen 538 and 566 nm.When introduce electron-donating substituents,such as phenoxy group,morpholinyl,piperidinyl and n-butylamino group,the absorption bathochromic shift while the electron-donating ability is improved,bettwen 536 and 692 nm have strong absorption,reach to the near-infrared region. When excitated them,only the phenoxy group compound has strong salmon pink luminescence in 572 nm,the others have no fluorescence.

其中，港湾位无取代的以及含吸电基团(—Br、—CN、对甲酰基苯氧基)化合物在525 nm左右处均有很强的吸收ε＞10~4M~(-1cm~(-1)，当光激发时，港湾位无取代、溴代和氰基取代物发出538～547 nm的强烈黄色荧光，对甲酰基苯氧基取代物则发出566 nm的强烈橙红色荧光；含供电基团(苯氧基、吗啉基、哌啶基、正丁氨基)化合物随着供电子能力的增强，吸收发生红移，在536～692 nm处均有很强的吸收ε＞10~4M~(-1cm~(-1)，达到了近红外区，当光激发时，只有苯氧基取代物发出572 nm的强烈橙红色荧光，而含氮供电基取代物均发生了荧光淬灭。

The statistical analysis of this large set of mutations has led us to propose a diagnostic strategy that should help with the molecular work-up of optic neuropathies.

这一大系列基因突变的统计学分析引导我们提出一个诊断策略，可以帮助我们对视神经病变进行分子学的诊断检查。

The results show that the pipe grouting changes the mechanical parameters of surrounding rocks to achieve the security of engineering objectives by reinforcing surrounding rocks and bolcking the water.

研究表明：小导管注浆一方面改变了围岩的力学参数，另一方面利用浆液的固结特性可以实现堵水和加固围岩的工程目标，使隧道在开挖过程中的安全得到保障。