圆周

The discovery that the Earth is a little world was made, as so many important human discoveries were, in the ancient Near East, in a time some humans call the third century BC, in the greatest metropolis of the age, the Egyptian city of Alexandria. Here there lived a man named Eratosthenes.

就如同人类许多重要的发现，这个发现是在古代的近东地区，时间是西元前三世纪，在当时最伟大的城市，那个埃及城市：亚历山卓，住著一个名叫Eratosthenes的人，他成就这个地球圆周长度的贡献。

Methods The effects of the reading error and the misalignment of the probes on the accuracy of measuring and all the harmonics of roundness were analyzed; The strategy and the algorithm for optimizing the parameters of the measuring system were proposed; The distribution and propagation patterns of the measured errors for all the harmonics of roundness were studied in detail; A software for correcting the errors caused by the measurement error of the angle positions of the probes and the sensitivity difference between three probes was presented.

分析了测头读数及角位置误差对圆度各次谐波及圆周各点测量精度的影响；提出了三点法测量系统的优化策略与算法；研究了三点法测量误差的分布与传递规律；提出了克服测头定位误差以及3个测头的灵敏度不一致影响的软件校正方法。

She would see the same number of rulers involved as did observer A, and so would likewise conclude that the ratio of circumference to radius did not conform with Euclidean geometry.

她将看到和观察者 A 一样数量的尺子。所以同样的，将可以做出这样的结论：圆周和半径的比率将和欧几里德几何不一致。

Roundness tolerance of pitch diameter Roundness tolerance for a minimum of 345o circumferential arc of the pitch diameter shall not exceed .002 inch (0.051 mm) total, or one half the pitch diameter tolerance if the pitch diameter tolerance is less than .004 inch (0.102 mm); roundness tolerance of the remaining 15o maximum circumferential arc shall not exceed .004 inch (0.102) total, provided such tolerance does not result in excrescence on the thread flank.

圆度公差沥青直径圆容忍最低限度的345o圆周弧音高直径不得超过0.002英寸（ 0.051毫米）总，或一的一半，足球场直径公差，如果沥青直径公差小于0.004英寸（ 0.102毫米）；圆的耐受性，其余15o最大周弧不得超过0.004英寸（ 0.102 ），共计提供这样的宽容不会导致在excrescence对线程的侧翼。

In the last chap-ter,the natural integral equation and natural boundary element method forharmonic problem on exterior elliptic domain are introduced.Then,based onthis,the natural boundary reduction method for a kind of exterior problem ofanisotropic constant coefficients elliptic equation is discussed, the natural inte-gral equation and its solving method on circular boundary and elliptic bound-ary are obtained.These results can be directly applied in coupled methodand DDM for exterior boundary value problem.

最后，讨论了椭圆外区域调和问题的自然积分算子即D-N算子及自然边界元方法，并基于此研究了一类各向异性常系数椭圆型方程外问题的自然边界归化方法，首次得到其在圆周边界及椭圆边界上的自然积分方程及其求解方法，并将这些结果直接应用于外边值问题的耦合算法。

The middle of each finger-shaped grass-poking wheel is provided with a round disk whose circumference is distributed with a plurality of finger-shaped teeth uniformly.

指形拨草轮中间为圆盘区，沿着圆盘的圆周均匀地分布着多个(10～12个)手指形轮齿。

We simulate numerically the far-field intensity distribution of 6 circular arranged coherent fiber lasers and estimate its power convergence based on Fraunhofer diffraction theory.

基于Fraunhofer标量衍射理论，计算了按圆周形排列的6束光纤激光相干合束的远场光强分布，并对其能量集中程度进行了讨论。

The far-field intensity distribution of 6 circular arranged coherent fiber lasers is simulated numerically and its power convergence is estimated based on Fraunhofer diffraction theory.

基于Fraunhofer标量衍射理论，计算了按圆周形排列的6束光纤激光相干合束的远场光强分布，并对其能量集中程度进行了讨论。

In this paper, normalized cubic Gauss sums distribution at unit circle is studied by analytical methods.

本文运用解析的方法，研究模为算术级数中素数的正规化三次高斯和在单位圆周上的分布。

A circle whose circumference rolls along the circumference of a fixed circle, thereby generating an ''.

周转圆一个围绕着另一个固定圆周长滚动的圆，从而产生圆外旋轮线或圆内旋轮线，即外摆线或内摆线

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了