对称

And if you think about it, all these different societies have different geometric design themes they use. So Native Americans use a combination of circular symmetry and fourfold symmetry. You can see on the pottery and the baskets ... Here's an aerial photograph of one of the Anasazi ruins; you can see it's circular at the largest scale, but it's rectangular at the smaller scale, right?

事实上，不同的社会有不同的几何建筑规划方案，在北美，人们喜欢圆形对称、四重对称，你可以在陶罐和篮子上看出来……这是Anasazi遗迹的航拍图，图上看出大局上呈现圆形，而局部则呈现方形。

Flowers bisexual, actinomorphic but androecium often slightly zygomorphic, usually (3 or)4- or 5(or 6)-merous, perianth biseriate, perigynous; bracteoles opposite, usually caducous.

花两性，辐射对称但是雄蕊群通常稍左右对称，通常4-或5 (或6)瓣，花被双列，周位；小苞片对生，通常早落。

Dip angle of coal seam leads to asymmetry of the movement, fracture of overlying strata and abutment pressure.

煤层倾角的影响导致了采场上覆岩层的运动和破坏呈不对称，支承压力分布也明显不对称。

C3 symmetry operation is regarded as a transformation operator in angular momentum representation and the crystalline potential in Oh symmetry can be simply derived.

将C3对称操作看作角动量表象的对称变换算符，推导出Oh对称性晶场势。

Three chiral phosphorus ligands were prepared using anisole as the startingat material.Their applications in the asymmetric hydroformylation and asymmetric conjug ed addition of diethylzinc to enones were investigated.

以苯甲醚为原料，合成了三种新的手性含磷配体，考察了三种配体在不对称氢甲酰化反应和ZnEt2对环己烯酮的不对称共轭加成反应中的应用。

Multicellular animals, a system, both radial symmetry and bilateral symmetry of the characteristics of comb jellyfish found in animals and Anthozoa animals.

多细胞动物的一种体制，兼有辐射对称和两侧对称的特点，见于栉水母动物及珊瑚纲动物。

Through systemic energy comparison and energy analysis between symmetric and asymmetric TBT, parallel and antiparallel TBT, as well as the conjugate TBT, we found: i.

对于对称单体，平行TBT的能量通常低于反平行TBT的能量，对于对称三体，平行TBT的能量通常高于反行TBT的能量。

In this paper,on the basis of the exact solutions for the antiplane and plane symmetric cases,the exact solution of the plane anti-symmetric case has been obtained.

在反平面及平面对称情形的精确解的基础上严格地求出了平面界面横向裂纹反对称问题的精确解。

In chapter 3, the paper proposed a new kind of preference relation, i.e. distance preference relation; followed this, a scale was introduced for constructing antisymmetric matrix, and consistency of the matrix was defined, three methods for computing priority vector were studied; At the end, two examples were used to demonstrate the application of the new method,and they showed that the introduction of antisymmetric matrix to AHP is effective and valuable.

本文首先对Saaty AHP的几种常见标度进行了比较分析，然后对正互反判断矩阵及模糊互补判断矩阵的权重计算方法进行了归纳和总结；最后，本文提出了一种新的偏好关系，即基于"差"的偏好关系，从而将反对称矩阵引入层次分析法，接着对新型偏好关系下判断矩阵的构造、一致性的定义与性质以及权重的计算方法做了初步的研究，最后用算例说明了新方法的应用，并做了相应的比较分析，结果表明采用基于"差"的偏好关系构造反对称矩阵拓展了AHP的应用范围，有一定的理论和应用价值。

Convergence of semi-iterative method was discussed by Varga, Young and HU Jia-gan when iterative matrix is symmetric. In this paper, using Chebyshev polynomial and its properties, we obtain the convergence of semi-iterative method for a class of antisymmetric iterative matrix.

本文依据Varga， Young，胡家赣书中介绍的迭代矩阵为对称阵时，半迭代法的收敛性的理论，以Chebyshev多项式及其基本性质作为基本工具，对一类反对称迭代矩阵，研究其半迭代法的收敛情况。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。