三维

Moreover, with the rapid development of computer technologies and virtual reality, WebGIS map publish system has been injected new vitality; in the situation of real 3D GIS development immaturely, the study of two-dimensional electronic maps and virtual scene integrated WebGIS system has some practical significance.

此外，计算机图形学及虚拟现实技术的快速发展，给WebGIS地图发布系统注入了新的活力，在目前真三维GIS系统发展不成熟的情况下，研究二维电子地图与虚拟场景集成的WebGIS应用系统具有一定的实际意义。

Starting with the basic concept about particle transport and the universal form of transport equation, the discuss is concentrated upon the transport equation and the implicit difference scheme under 3-D Cartesian coordinate, as well as the transport equation and the discontinuous finite element scheme under 2-D cylindrical geometry.

从粒子输运的基本概念和输运方程的一般形式入手，重点讨论了三维直角坐标中子输运方程和隐式差分格式，以及二维柱坐标中子输运方程和间断有限元格式。

Particle Image Velocimetry is a technique of measuring instantaneous 2D and3D velocity fields growing rapidly in recent years.

粒子图像测速技术(Particle Image Velocimetry，PIV)是近年来发展很快的一种定量化的瞬时二维及三维流场速度场测量技术。

Starting from the concept of Measured Equation of Invariance and the local equivalent theorem, it regarded the determination of the truncation boundary condition as a question of field simulation in a small area near the grid boundary. The practical disposal in the 2D and 3D cases was discussed.

基于测度不变方程的概念和局部等效原理，将截断边界条件的确定归结为网格边界上一小区域的电位场模拟问题，并讨论了在二维、三维情况下的具体处理。

Although we can use 2-D forward and inversion to solve problem in work, but the method is not adapted with 3-D geoelectric section.

虽然采用二维反演方法可以解决一些野外实际问题，但与实际三维介质相比其计算精度和整体反演效果仍然不能满足实际的需要。

Orienting directed from the theory of "interbed" put forward by Leake, based on the Terzaghi\'s effective stress principle, the principle of coupling groundwater flow equation and soil deformation equation is analyzed in this paper. And the land subsidence model coupled by three dimensional groundwater flow model and one dimensional soil deformation model was built.

本文从Leake提出的含水层内的"夹层"理论出发，在Terzaghi有效应力原理的基础上，分析了地下水流方程和土体变形方程耦合的机理，建立了由三维地下水流模型和垂向一维土体变形模型耦合得到的地面沉降模型。

By the aid of a example, the parameters were solved with the tangent line of a circle, the intersection point of tangent and thecoordinates defined by the geometrical relationship of the image based on two propositions proposed in the paper.

借助实例，在文中建立的2个命题的基础上，通过对圆的切线、切线交点及所成像的几何关系确定的的坐标进行参数求解，得到确定模型的二维像和三维像。

In addition,3-d subspace in quotient image method doesn't suffice to represent all images of an object under varying illuminations.Therefore,an improved method based on image on 9-d linear subspace constructed using 9 images of object under the configuration is presented to overcome these deficiencies.And 9 images of another object under the configuration are generated.

此外，商图像方法中简单的三维点光源模型无法很好地近似任意光照情况，因此，提出一种基于九维线性子空间的改进的商图像方法，并利用改进后的商图像方法合成对象在统一配置光源方向下的9幅图像，克服了Lee所提方法的不足。

Two-dimensional graphics are the eight-track player or even LP record of yesteryear. They will be soon replaced by 3D graphics as more of you perfect the art.

二维图像就好比过时的8声道播放器，或是隔年的LP唱片，随着您对图像艺术的要求越来越高，它将很快被三维图像取代。

Figure 1.1: Geographic coordinates are converted from 3D to 2D using a map projection.

图1.1：地理坐标是从三维到二维转换使用地图投影。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。