中心圆

By the circular current symmetry characteristic,on the basis of Biot-Savart law,the expression of the whole-space magnetic induction intensity distribution was deduced in the spherical coordinates system.

在球坐标系中，由磁感应强度的计算公式毕奥-萨伐尔定律出发，利用圆电流磁场的对称性推导出全空间磁感应强度B分布公式，讨论了圆电流平面上和中心轴线上的磁场，应用C数值计算方法对全空间磁感应强度B公式求解，绘制出磁感应强度分布的主要区域及磁场的空间分布图，并对全空间磁感应强度B分布特点进行了讨论。

Standing in the center of the circle and requesting that the Lord or Lady enter your circle.

站在魔法圆的中心并进行请求神灵或女神进入你的魔法圆。

Now make a smaller circle and put it in the center of the big circle.

接着再画一个稍小点的圆，把它放在大圆的中心，如下图所示

Expanding from the center of the circle get a maximum boundary in the limitation of 80㎡get a circle with radius 5m.

从这个圆的中心扩张，在80平米的限制之下得到一个最大化的边界：半径为5米的圆。

Circular ring connected by spokes to a hub, designed to turn around an axle passed through the center.

轮子由''。'辐'。''条连于轮毂之上的实心圆盘或坚硬的圆环，被设计用以围绕穿过其中心的轴旋转

Due to the coupling of every Zernike circular polynomial in the annular field, the SEIDEL coefficients solved by wavefront fitting with circular polynomial for annular pupils with big central obscuration would have larger errors.

由于Zernike圆多项式各项在环域上的交叉耦合，对于具有大中心遮拦的环孔径波面采用圆多项式拟合求解SEIDEL像差系数存在较大误差。

The rectangle shaped member mentioned by this article is a prefabricated one for the internal construction of circular tunnel, and is located along tunnel axis line, to be lifted into place by a dedicated crane onboard the shield machine in synchronised manner, followed by placement at both sides of tunnel, of ballast block, or in-situ cast members, corbel, pavement slab and the like.

由于隧道比较长，为节约工期，在盾构机推进的同时，隧道的内部结构也跟进施工，本文所叙述的口字型构件是圆隧道内部结构中的预制构件，它位于圆隧道的中心轴线位置，在同步施工中由盾构机上的专门起重机吊放入位，再于两侧施工压重块、牛腿、路面板等现浇结构。

The Fresnel lens, also known as the dioptric lens, consists of a central glass disk and concentric glass rings or a central glass band surrounded by parallel glass rings.

一个在中心的玻璃圆片和与之同圆心的层层玻璃圆环，或者中间是一个玻璃带，两边是与之平行的玻璃带状环。

Applying elliptic integral to calculate the electric potential due to uniformly charged ring, and then gets the general expression of the electric intensity by using gradient operation.

0引言对于均匀带电圆环电位和电场分布，在许多电磁学文献中仅仅只计算了与环面垂直的中心轴线和离圆环很远区域的电位和电场，而对其周围空间任意一点的值未作讨论。

The paper induces and analyzes research method of the tooth, including Method line of the tooth theory,Envlopment theory, Camus theory, Circling cluster theory and so on.Based on the past theories,the new measure to deduce the chain wheel tooth equation of roller chain at high speed,Circling cluster and envlopment theory,is proposed by analyzing basic concept of equidistant curve and Willis theory.Following the presentation of drawing lessons from traditional roller chainof the change of stanza line distance. A new type of roller chain at high speed is given in the paper.The paper studies deeply structural characteristics, the change of stanza line distance,separation between plank and bore and so on.According to design requst of roller chain at high speed and the study ofH_y--V_0 tooth chain,the impossibility that Quasi-conjugage engagement theory isrealized by the engagement of roller chain at high speed from the aspect of theory is decribed.

作者综述了高速滚子链国内外研究现状，并进行了以下研究工作：归纳分析了齿形法线法理论、包络法理论、卡姆士定理、圆族法理论等齿形研究方法，在此基础上，结合齿形啮合基本定律，分析了等距曲线的基本概念，提出了一种推导高速滚子链链轮齿廓方程的新方法—圆族包络法；在借鉴普通变节距滚子链的基础上，本文提出了一种新型的高速滚子链链条，深入研究了高速滚子链链条结构特性及其变节距、板孔中心分离等特性。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。