向中心

This Sm-catalyzed reaction firstly efficiently realized the catalytic cycle in the tandem rearrangement/reduction reaction of α-hydroxy epoxides, and moreover the diastereoselective amplification could be distinctly observed when two C1 epimers in substrate were subjected to this catalytic tandem reaction.

该催化的多功能串联反应，高度非对映选择性地一步控制了含有季碳的三个相邻立体中心，有效地构建了&2-季碳1，3-二醇&结构单元，首次实现了此类重排—还原过程的催化循环，其中对于两个C1位的差向异构体底物，此反应具有明显的非对映选择性放大特点。

At the same time, line up buyers of real estate are quietly changing, showing the past, inner ring, in the Link as the central axial expansion of the outer ring of regional trends.

与此同时，排队购买房地产正悄悄地发生变化，显示过去，内环，在链接为中心轴向扩大外环区域的趋势。

The mantle flux presents a fan-shape flow towards the Pacific oceanic region, and is possibly a field source at deep level of the Baikal rift system and East China.

它们的形成不仅受太平洋板块的俯冲和印度－欧亚大陆碰撞的制约和影响，而且位于中国西南部的地慢流发散中心，呈扇状向太平洋区流动，可能是它们在更深层次上的共同场源基础。

According to the literature about the manufacture models of three kinds,radial feed- rolling cutter ,broach and Gleason cutter,the effect of centre point-centre line method,centre deviation method and oblique feed on qualified gear length were inspected.

根据滚刀、拉刀及格利森铣刀盘三类径向进给的制造模型相关文献，考察了中点中线法、中心偏移法、斜向进给对给出合格齿长的影响，指出了各类刀具的制造模型的异同，为这种研究提供了借鉴

The Command System is the ship's "brain", central to the ship's fighting capability, providing the officers and crew with vital information from sensors and communications and allows them to direct weapon engagements above, on and below the surface.

指挥系统向指挥员和战斗员提供来自传感器和通过通信系统获得的重要信息，是军舰的&大脑&和战斗能力中心，并使作战人员能指引武器对抗来自各方面的威胁。

In this paper, experimental researches and computer simulations are presented on dynamics behaviors of free-free tubes laterally impacted by flat-nosed cylindrical missiles at the middle of their spans.

本文主要对自由圆管在其中心部位经受刚性、平头弹体侧向冲击时的动力学行为进行了实验研究和计算机仿真。

The stretching influence on the near trusses should be considered when using the stretching-twice method, and the construction is hard to be controlled. The Harbin exhibition sports center with a 128m support span, attached to a deep design calculation of the super-large span prestress truss string structure, stretching once in tension bed method is brought forward for the bottom cable of the single truss string structure. From calculation research on the friction force between the tension bed and the truss string structure, the friction influence is considered for the displacement method of the middle of span, with the action of the fixed cable stress. This method, with vertical displacement of the middle of span as its main control target for prestress stretching, is successfully applied in the prestress stretching construction of the project.

二次张拉需考虑张拉对相邻桁架的影响，施工控制难度大，本文结合哈尔滨会展体育中心支座跨度128m的超大跨度预应力张弦桁架结构的深化设计计算，提出了单榀张弦桁架下弦拉索胎架一次张拉法施工方法，通过对张拉阶段胎架与张弦桁架间摩擦力的计算研究，定量索力下跨中位移法考虑摩擦力影响，以跨中竖向位移作为预应力张拉的主要控制指标，成功地完成了该工程预应力张拉施工。

Some economicanthropologists with economic background,especially formalists,advocatedthat the methodology of economics should be comprehensively andsystematically brought into the study of economic anthropology.

近年来，美国经济人类学的研究视域向广义拓展，主要的有：关于前资本主义状态中的原始民族、游牧民族、农业社会的经济行为与经济制度研究；关于工业化社会中的一些新命题的研究，如性别角色、一般财富源泉、非经济因素对经济发展的影响、欠发达的农业区域寻求市场发展的途径、市场的中心地位理论以及市场条件下的基础性经济行为等研究。

The first method is the four-phase method that is commonly used in our country and foreign countries at present.

京港澳高速公路是国家高速公路网（7918网）中的一条射线，自北向南连接北京、石家庄、郑州、武汉、长沙、广州、香港、澳门等8个中心城市，是连接华北、华中、华南的交通大动脉，是我国最早规划的高速公路干线，在国家公路网中具有十分重要的地位和作用。

Golden Valley through the construction of agricultural supplies supermarket chains for farmers to provide high-quality low-cost means of agricultural production, and as a platform to carry out the majority of farmers to provide various forms of free services, such as soil testing, fertilization, pest and disease control, science and technology fields, and so on. The second half of 2001, Golden Valley also introduced the "Golden Valley of the green food circulation agriculture projects"(in Hebei, Henan provincial government support), gold-chain of agricultural products distribution center as the carrier, value-added agricultural products for farmers to solve the problem, Lead to a well-off farmers.

金色谷通过建设农资连锁超市为农民提供优质廉价的农业生产资料，并以此为平台开展向广大农民提供多种形式的免费服务，例如测土施肥、病虫害防治、科技种田等。2001年下半年，金色谷又推出了&全国金色谷绿色食品流通兴农工程&（已得河北、河南等省政府支持），以金色谷农产品连锁配送中心为载体，为农民解决农产品增值问题，引领农民走向小康。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。