未知数

This paper systemically introduces the history and current status of the study on the problem of orthotropism and displacement back analysis, recounts and concludes the analysis theory about anisotropic rock mass, brings forward some models of displacement back analysis of the rock such as layered orthotropic model, proportional coefficient model, layered homogeneous model and equivalent simplificated model, and establishes target unknown, target functions and arithmetic for these models respectively, through analyzing the character of layered orthotropic rock mass.

本文系统介绍了正交各向异性问题和位移反分析方法研究的历史与现状，叙述与归纳了各向异性岩体的分析理论，通过分析成层正交各向异性岩体的特点，对该类岩体的反分析方法提出了分层正交各向异性模型、比例系数模型、分层均质模型和等效简化模型，并对各类模型分别确定了目标未知数、目标函数与算法。

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由于绝大多数的搜索引擎并没有抓取，分析js语句的能力，因此，通过js语句输出的链接代码，搜索引擎无法抓取到，同时，搜索引擎并不能很好地抓取i的内容，因此使用i包含链接页面的友情链接形式也是无法被搜索引擎抓取到的，这两种链接都是无效链接，一个简单的判断方法是，查看对方链接页面的源文件，如果没有能找到你的页面地址，那就应该是用上面2种方式输出的链接了，这里也有一种例外的情况，在页面上直接使用js语句输出链接，例如 write 一路读这样的形式，也是js语句，但是页面可以找到，这样的链接，理论上讲搜索引擎是会抓取到的，但是会不会把它等同于普通的链接，还是个未知数。

The extent of other psychopathology in patients with ESRD is largely unknown.

其他ESRD患者的精神问题大部分仍是未知数。

The purpose of this study is using linear regression to obtain the relationship between the residual system errors and the distances .

本研究的目的是使用线性回归的方式来求出残留系统误差与距离的关系式，并分别采用间接观测平差、条件带未知数平差与完全最小二乘法来求解，并分析其差异性。

To this day no one knows who the ripper was.

所以，到底谁是凶手，仍然是一个未知数。

So it's a 3 by 3 matrix, 3 equations and unknowns, and what's our right hand side?

因此，它是一个3行3列的矩阵，3个方程三个未知数，我们的右侧是什么呢？

The method is to add a term into the original singular kernel while it subtracts its analytical solution from the original equation. Since the singularity of Green's function can be eliminated by such a mathematical technique, shape function does not need to be supposed while solving the unknown. The calculation can be directly applied to the real shape of the object by taking the integral points distributed on the object as nodes that satisfy boundary conditions.

由於格林函数的奇异性经过数学上的技巧加以消除，因此当求解未知数时已经不需要再假设形状函数，即可直接使用物体真实的外型来做计算，也就是直接将物体上分布的积分点视为满足边界条件的节点。

Mathematics Not solvable for the unknowns by the same set of values.

不可解的：同一系列值的情况下由于有未知数而无解的。

A group of equations of the form are called a system of equations with m linear equations and n unknown variables.

例如的一组方程称为m个线性方程，n个未知数的方程组。

The prime mover behind Tawa's auction is a village party secretary, Zhang Yuwang, who happens to own, he claims, the usage rights to most of the land in question.

塔洼拍卖的首倡者是一个叫做张欲望的村支书，他宣称，对于绝大部分土地的使用权，究竟能有多少为自己所有还是个未知数。

Methods: Five patients with parkinsonism or dystonia were assigned to general anesthesia using an modified endotracheal tube.

本实验依照人体实验之相关规定进行，五位患有帕金森氏症或肌张力异常的病人接受神经立体定位手术。

If you can benefit from this book, it is our honour.

如果您能从本书获益，这将是我们的荣幸。