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Thus, we redesigned and synthesized a series of new precursors devoid of the unfavourable structural elements for the organocatalytic intramoleculor aldol reactions.

我们重新设计合成了该关环前体的衍生物，希望除去分子中不利于Aldol反应的结构单元以实现关环反应。

The practically oriented treatment of dynamic structural buckling is undoubtely be hampered by two problems, how to adopte a existed criterion or advance a new criterion of dynamic stability in general sense, and how to develope a simple and appealing algebraic representation in terms of singularity of the tangental stiffness matrix .

实际解决动力稳定问题的进程无疑受碍于怎样选用已有的或发展新的一般意义上的动力稳定性判定准则，以及怎样发展简洁的富有吸引力的切线刚度矩阵奇异性的代数描述方法。

The competitive products are Senmao Alicyclic Epoxy Resins CER-170, Reactive Epoxy Flexibilizer CYH-277, and Modified Alicyclic Epoxy Curing Agent WZH-155 Series. These unprecedented hi-tech products satisfy all the demands both at home and abroad, which are widely applied in the fields such as photoelectron, IT digit and UV-resistant electrotechnical casting, outdoors alicyclic coatings, building structural glue and epoxy matrix composites and so on.

公司拥有年产2000吨脂环族环氧树脂和年产5000吨反应型环氧增韧剂及环氧固化剂等生产装置；其主导产品为：森茂牌脂环族环氧树脂CER-170、反应型环氧增韧剂CYH-277、改性脂环胺环氧固化剂WZH-155系列，均为填补国内外空白的高新技术产品；广泛服务于光电子、IT数码产业以及耐紫外线电工浇注、户外环氧涂料、建筑结构胶、环氧复合材料等领域。

The beam waveguide mirrors are placed in the steel tube segments in readiness for installation amongst the alidade structural beams.

束波导镜子放置在钢管部分准备安装在照准结构横梁。

The cytotoxicity of these compounds were valuated by MTT and SRB methods using three cancer cell lines: HL-60, A-549, P-388. Cyclo-shikonin, and cyclo-alkannin have high cytotoxicity against HL-60.The chiral center of side chain has no effect on their activity. 2- 1-(Acetyloxy-4-methyl-3-pentenyl -5, 8-dihydroxy-1, 4-naphthoquinone (105) has strong inhibition effect on P-388 cells. 2- 1-(isooctyloxy-4-methyl-3-pentenyl -5, 8-dihydroxy-1, 4-naphthoquinone (108) and 2- 1-(2-furoyloxy-4-methyl-3-pentenyl -5, 8-dihydroxy-1, 4-naphthoquinone (112) have high inhibition on A-549.Shikonin (1), alkannin (2), and their derivatives have the structural features of a planar chromophores and short side chain. We examined the ability to inhibit the telomerase.

抗肿瘤活性初步筛选测试采用小鼠白血病P-388肿瘤细胞和人肺癌A-549肿瘤细胞进行，结果表明侧链羟基的手性对抗肿瘤活性无明显影响；有数个化合物具有很好的体外抑制活性，特别是化合物2-（1-异辛酰氧基-4-甲基-3-戊烯基）-5，8-二羟基-1，4-萘醌（108）和2-[1-（2-呋喃甲酰氧基）-4-甲基-3-戊烯基]-5，8-二羟基-1，4-萘醌（112）体外显示对人肺癌A-549肿瘤细胞有强效；2-（1-乙酰氧基-4-甲基-3-戊烯基）-5，8-二羟基-1，4-萘醌（105）对小鼠白血病P-388肿瘤细胞有强效；环紫草素和环异紫草素对人白血病HL-60细胞有强烈抑制作用。

Write the structural formulas for a cyclic alkyne hydrocarbon with the fewest number of C's which has a meso stereoisomers.

答：写出有内消旋体的且含有碳原子数最少的环炔烃，给出内消旋体的结构式，并命名这些化合物

Write the structural formula for an alkyne hydrocarbon having the fewest number of C's, which has geometric isomers, and give the IUPAC name for both geometric isomers.

答：写出有几何异构体的，含碳原子数最少的炔烃的结构式，并对所有的异构体用IUPAC命名法命名

The method and processes to design and optimize the composition of low alloy structural steel was given.

提出了从相结构因子和界面结合因子出发进行低合金结构钢的成份优化设计的方法和步骤。

It generally refers to the carbon structural steel and medium carbon alloy steel.

它一般是指中碳结构钢和中碳合金结构钢。

At the same time, from the angle of complexity of public information resources management it comprehensively proves insufficiency of the government public information service such as discriminatory service, mandatory service, asymmetrical service and rough service, which not only increase the government management cost but also lead to the structural form rupture of public information resources management at various levels, such as the government and the public, super and subordinate governments, central and local governments, and consequently break the almightiness mythology of government monopoly in public information resources management.

同时，从公共信息资源管理的复杂性角度全面论证了政府公共信息服务的不足，如差别服务、强制服务、不对称服务以及粗糙服务等不仅造成了政府管理成本的攀升，而且也导致政府与公众之间、上下级政府部门之间以及中央与地方之间等不同层面公共信息资源管理的结构型断裂，并在事实上打破了政府垄断公共信息资源管理的全能神话。

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。