四维的

By taking the strategy of uniting geometry with algebra and using the method of minimal value, the distance problems between a line and a line in four dimensional space are investigated and the caculation formula are given.

用形数结合的观点和极小值法，研究了四维空间中两直线间的距离问题，并给出了相应的计算公式。

In this paper, we mainly discuss a kind of surfaces in4- dimensional Pseudo-Euclidean Space and give the classification of such surfaces with constant mean curvature and Gauss curvature.

文章研究四维伪欧氏空间中的一类曲面，给出了具有常平均曲率、高斯曲率及相关平均曲率和高斯曲率的这类曲面的分类。

It is better to introduce no other mass concept than the 'rest mass' m .

首先它把"质量"这应该属于某四维向量的大小名字强加在的此向量的时间部上。

It is better to introduce no other mass concept than the 』rest mass』 m .

首先它把「质量」这应该属於某四维向量的大小名字强加在的此向量的时间部上。

The results indicate that the hybrid variational method can correctly estimate soil moistures in the deep layers.

试验的结果表明混合四维同化方法具有较好的反演深层土壤湿度的能力。

Samuel ha-Kaan, at the close of the first century, gives in his saying on the Ages of Man in the Baraita attached to Abot v. 21 (see Mazor Vitry, p. 549) the completion of the thirteenth year as the age for the commandments; and the commentary to the passage refers to Levi, the son of Jacob, who, at thirteen, is called "ish"= man; Gen. xxxiv.

塞缪尔哈kaan ，结束时，第一世纪，让他说，对不同年龄的男子在baraita重视abot诉21条（见mazor vitry ，第549页）在完成第十三届一年，因为该年龄诫命（"乐miwot "），以及评通过，是指列维的儿子雅各布，世卫组织，在13名，是所谓的"原位杂交"（=男子；将军三十四。

Comprehensive analyses of hydrocarbon pooling elements such as thermal evolution of source rocks, the time of pooling and the history of fracturing show that evaporate fractionation was induced by the Himalayan decompression through fractures and the invasion of large volume of allochthonous dry gas.

结合该区烃源岩热演化、油气成藏时间、断裂活动史等成藏要素的四维耦合性剖析，结论认为：喜山期断裂泄压作用以及大量他源干气的侵入诱发了该区蒸发分馏作用的产生。

3To introduce a minimally-invasive technique of a new percutanous external spinal fixation assistanted minimally-invasive surgical procedure treating thoralumbar fracture and analyse its clinic applicable area and value. [1]According to advantage of spine external transpedicular fixation technique and limitation of traditional percutanous external transpedicular fixation,design a new percutanous external transpedicular fixation.

(1)根据脊柱外固定技术的优点，传统脊柱外固定器的不足自行研制一套新型脊柱外固定器(WS-1型)；(2)取7具新鲜小牛腰椎标本，自制实验不稳定性骨折模型，把实验分成正常A组、骨折模型B组、新型脊柱外固定器固定C组、新型脊柱外固定器固定联合PVP技术D组，分别按顺序测试四组的三维稳定性，并测试A组、C组与D组在300N轴向压缩实验，再行统计学分析比较；(3)应用新型脊柱外固定器联合椎间盘镜微创椎管减压技术和PVP技术手术治疗胸腰椎骨折，病例选择：本组病例共69例，年龄自10岁-70岁，平均年龄56.3岁。

In addition, by means of the Object-Oriented Methodology, the article reasons out an unified open 4-Dimensional Geomorphic Computer Model

然后，以面向对象的方法论为指导推导了一个统一的、开放的四维地貌计算机模型。

Polygenetic compound deposit is characterized by " five many".

作者于1979年开始提出多因复成矿床概念的主旨，是为了阐明从时空四维并重的角度来认识与研究成矿的重要性。

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。