四维的

This paper bases on the technique of virtual prototype and utilizes software platform of UG, ADAMS and ANSYS to establish three-dimensional digitized virtual prototype of double link jib system of portal crane and systematically do its analysis of dynamics emulation of multi-body system.

本文基于虚拟样机技术，利用UG、ADAMS、ANSYS软件平台，建立了门座起重机四连杆组合臂架系统的三维数字化虚拟样机，并对其进行了较为系统的多体系统动力学仿真分析，实现了计算机对组合臂架系统在各种工况下随载荷变化的运行状态及随时间变化过程的仿真，得到的相关仿真分析数据对于门座起重机组合臂架系统动态设计提供了有效的手段。

Chapters Four and Five illustrate that Soviet Union annexed the area of almost 720,000 km2 during World War II, including the three Baltic countries, Bessarabia and North Bukovina of Romania, Western Ukraine and Western Belarus of Poland, Karelia and Petsamo of Finland, Outer Carpathian-Ukraine of Czechoslovakia, Konigsberg of Germany, Tannu-Uriankhai of china, Kuril islands and South Sakhalin of Japan.

第四章至第五章论述第二次世界大战期间，苏联兼并了波罗的海三国、罗马尼亚的比萨拉比亚和北布科维纳、波兰的西乌克兰和西白俄罗斯、芬兰的卡累利阿和贝柴摩、捷克斯洛伐克的外喀尔巴阡乌克兰、德国的哥尼斯堡、中国的唐努乌梁海、日本的千岛群岛和南库页岛等地区，总面积近72万平方公里。

In Chapter Ⅳ, the reliability of the scheme presented in this paper is proved by numerical experiments for solutions of shock tube flow problem and Laval nozzle flow problem. The treatment of boundary conditions is also described.

第四章通过对一维激波管、Laval管的数值计算验证了本文所采用的格式的可靠性，同时给出了边界条件的处理方法，并讨论了对应不同精度参数的TVD格式对计算结果的影响。

In all four collaborative design forms, the implementation of synchronous and multiaddress collaborative design is most difficult....

在四种不同的协同形式中，实现同时异地协同设计的技术难度最大；在不同的协同设计对象中，实现面向三维实体模型的协同设计难度最大。

In all four collaborative design forms, the implementation of synchronous and multiaddress collaborative design is most difficult. Collaborative design with three-dimensional solid models is more difficult realized than collaborative design with some others such as text files.

在四种不同的协同形式中，实现同时异地协同设计的技术难度最大；在不同的协同设计对象中，实现面向三维实体模型的协同设计难度最大。

On the normotensive rat, pretreatment with verapamil (0.25 ug/0.1 ul/site), the blocker of calcium channels, by microinjection into the rVLM bilaterally, not only caused a complete block effect on the elevation of BP, HR and the pressor response to defense stimulation by the subsequent microinjection of physostigmine, glucocorticoid or mineralocorticoid (the same dosage as mentioned above) into the same sites, but also led to a slight reduction on the basal cardiovascular activities to a certain extent.

四、在正常血压大鼠上预先用钙通道阻断剂维拉帕米(0.25μg/0.1μl/site)微量注射至双侧rVLM，不仅能阻断随后在同部位微量注射毒扁豆碱(0.4μg/0.1μl/site)、肾上腺糖、盐皮质激素(分别为40ng/0.1μl/site)所致的升压、加快心率、以及电刺激dPAG诱发的防御性升压反应，而且能引起上述指标不同程度的较弱的降低。

This paper Puts forward the four main parameters of the Permeability classification for coal mass es, that is,the fractal dimension of the cracks in coal mass es,the number of the cracks in one meter's characteristic scale, the conducting water coefficient of coal samples and its Porousness; and founds the mathematical pattern of the complex judgement by fuzzy sets.

提出了进行煤体渗流特性分类的四个主要指标，即煤体裂隙分布的分形维数D、特征尺度L＝1m的裂隙条数N、煤样导水系数T和煤的孔隙率η等；建立了煤体渗流特性模糊数学综合评价的数学模型；根据煤层注水工程应用的实际情况。

Shaw found the costume to be physically challenging during his scene; he had difficulty breathing through the two small holes in the quarter-inch thick Darth Vader mask that covered his entire face and head.

肖觉得这一幕中所穿的戏服是一个对身体的挑战；四分之一英寸厚的达斯·维德面具覆盖了他的整个头面部，他难以通过上面的两个小孔中呼吸。

In chapter 3,we dig out two families of invariant quartic curves of a quadratic system.

第五章讨论向量场具有对称中心的二次系统，利用系统的不变双曲线及不变四次曲线，我们确定了一个对应极限环（1.1）分布的二维参数区域，其边界的构成为如下几种常见的极限环分枝：霍夫分析，庞加莱分枝，同宿分枝和异宿分枝。

Rufaan Tigellinus was created by Paul Sudlow for Galaxywide NewsNets, which was a recurring series of articles that appeared in the Star Wars Adventure Journal; he first appeared in issue eight, published in November 1995, and made frequent appearances until issue fourteen, some of which were written by Peter M.

茹法安·提格利努斯是保罗·萨德洛为"全银河新闻网"、一个经常出现于《星战探险日志》中的栏目所创作的人物，这一人物最先出现于1995年11月发行的第八期中，随后便频繁出现直至第十四期，其中部分文章是由彼得·M·史维克福所撰写的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。