查询词典 PRE

I find you have a pre yopia and ametropia .

根据检查，我发现您得的是老视眼，并有屈光不正。

To our knowledge, however, it has never been used for reductive amination of carbonyl compounds, nor for reduction of pre-formed imines.

可是据我们所知，它还从来没有被用于羰基的还原氨化和用于一个已制亚胺的还原。

Amory Lovins said once that in the pre-industrial age, there were abundant resources and very few people, so we invented machines to make humans more productive.

埃默里。罗文斯说过，前工业化时期是资源充足、人烟稀少，因此我们才发明了机器来帮助人们提高生产力。

Actually you can even get around the declare before omit ampersand rule by using the subs.pm pragma, or by pre-declaring as in a script like:#!

实际上，我们甚至可以通过使用subs.pm的语法来把这个可以省略与符号的规则扩展开，或者通过在脚本中预申明来实现，例如：#！

The conductivity of amphibolite can be fit to Arrhenius equation at 1.0 GPa and 200-700℃, the pre-exponential factor is 25.78-105.32 S/m and the activation energy is 0.57-0.66 eV.

在1.0 GPa、200~700℃条件下，斜长角闪岩样品的电导率符合Arrhenius公式，指前因子为25.78~105.32 S/m，活化能为0.57~0.66 eV。

By using the OP-10/JFC/ amyl alcohol non-ionic compound emulsifier as stabilizer, about 12% organosilicon was appended after the pre-polymerzation of MA, n-BMA, and MAA acrylate monomer was performed and the temperature was decreased to 62℃, and then the pH value was controlled in 7~8 after the polymerization.

结果表明，以OP-10聚醚渗透剂JFC/戊醇非离子复合乳化剂为稳定剂，在MA、n-BMA、MAA丙烯酸酯单体形成预聚体后降温至62℃，加入12%左右的有机硅单体，反应结束后控制pH值7~8，微乳液具有良好的稳定性，乳胶粒具有翻转型的核－壳结构。

Objective Probe into the clinic operation important function under standardized managment,preˉvent anaesthetize the dangerous factor and prevent various kinds of complication.

目的 探讨非住院手术在规范化管理下，杜绝麻醉危险因素，防止各种并发症的发生具有重要作用。

The data of the pre and post reconstruction of microwave time comparison system is collected and processed. The performance of one-way time transfer of previous system, the digital channel and the analog channel of the reconstructed system are analyzed, and the performance of two-way time comparison of the analog channel and the performance of GPS CV time comparison are analyzed too.

对改造前后的微波时间比对系统和GPS共视比对系统进行数据采集、处理，分析了改造前微波时间比对系统的单向时间传递性能，改造后的数字微波时间比对系统数字通道和模拟通道的单向时间传递性能，模拟通道的双向时间比对性能及GPS共视系统的时间比对性能。

To keep away from digital distortion caused by analog conversion,"Boutique Recording" applies APOGEE Analog to Digital Converter System in pre-recording, adopts Hi-End Prism Sound Digital to Analog Converter System during post mix and master disposal processes. In a word,"Boutique Recording" minimizes the distortion rate, and maintains the unique spirit of analog music.

为避免后期缩混时过多数字设备所造成的数码味，录音师坚持在前期录音与母带处理过程中使用传奇的模拟设备，在现场录音的同时进行立体声混音工作，为了避免模数转换时所造成的数字失真，达人艺典在前期录音中采用APOGEE模数转换系统，后期缩混及母带制作采用顶级HI-END厂牌Prism Sound数模转换系统，将失真率减到最低，保持独有的模拟音乐味道。

The basic approach of protecting people from being hurt or killed in an accident is to improve crashworthiness of vehicles. This paper starts with discussing theories and methods for vehicle passive safety design, which included experiential methods, analytic methods, multi-body dynamics methods, crash test methods and the finite element method. Emphasis will be paid to the basic FEM theories and algorithms of impact problems. Topics discussed include the governing equation, element discretization, hourglass control, time integration, material model, shell element algorithms and contact-impact algorithms. For more reliable simulation results, this paper then conducts study on how to accurately get material model parameters by combining the FEM method with experimental method, and develops relevant material test machine and parameter calculating software. Based on that, basic typical impact simulation and test validation study are conducted. On the basis of the above work, the paper studies the thin-shell structures'crashworthiness, which was affected by the following factors: spot-weld features, shell thickness, cross-section and pre-deformation. As to vehicle parts'crashworthiness, the paper conducts simulation study of designing energy-absorbing steering system and adaptive airbag system. A practical energy-absorbing steering wheel is designed as an example. In further depth research, the paper suggests several inverse quantificational methods for vehicle crashworthiness design based on the ideal crash characteristics. The above theories and methods are applied with good results through several practical vehicles' crashworthiness design and improvement.

文中对汽车碰撞安全性的设计理论和方法进行了归类和总结，其中包括经验法、解析法、多刚体动力学法、试验法以及有限元方法等；重点介绍了碰撞有限元法的基本理论和有关算法，涉及到有限元求解控制方程、单元离散、沙漏模态控制、时间积分、材料模型和应力修正、薄壳单元算法以及接触碰撞界面算法等，探讨了有限元计算中的材料模型参数获取技术，开发了相应的材料试验装置及材料模型参数反求软件，在此基础上进行了基本的碰撞仿真算例和试验对比研究；文中通过应用有限元方法研究了薄壁构件的碰撞吸能特性，指出了设计薄壁吸能构件时需要考虑的几个主要影响因素，即焊点、壁厚、横截面和预变形等；在关于车辆部件的碰撞安全性能设计中进行了吸能转向机构和自适应安全气囊的仿真研究，提出了吸能转向机构和自适应安全气囊的仿真研究方法；文中最后探讨了整车碰撞性能的设计与改进方法，提出了以理想碰撞特性为目标，采用分段加速度或者根据碰撞时间进行设计的反推设计法、部件吸能仿真优化设计法等量化设计方法，并通过综合应用文中所讨论的相关技术进行了整车碰撞性能的设计与改进实例研究，所选定的车型是大众化的普通轿车和碰撞安全性基础较差的微型面包车，研究结果表明，本文所提出的设计与改进方法是适用而有效的，具有重要的工程实用意义和价值。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。