这颗星球每围太阳绕行一周，它的椭圆形轨道的中轴就变化一次。
The mainaxis of the planet's orbital ellipse shifts each time it goes round the sun.
艾萨克·牛顿在其后发现彗星沿椭圆轨迹移动，处于环绕太阳的椭圆形轨道上，他还准确地预测了彗星能够一次又一次地回归。
Isaac Newton later discovered that comets move in elliptical, oval-shaped orbits around the Sun, and correctly predicted that they could return again and again.
您可以在每一次创建一个矩形或椭圆形等形状时激活网格。
You can activate the grid every time you create a shape such as a rectangle or an ellipse.
该方案是基于椭圆曲线，采用一次一密签名构造的，具有安全性高，速度快，密钥量小，便于实现等优点。
This scheme that is constructed based on elliptic curve with one-time pair of keys has the merits of security, efficiency, smaller key and easy realization.
利用标准椭圆封头胎具，采用二次冲压成形工艺，缩短了制造周期，大大降低了制造成本。
The manufacture time and cost can be sharply reduced by adopting two times punch shaping process with the aid of the mould of standard elliptical head.
举例编制了椭圆轮廓上球形螺纹的宏加工程序，此方法适用于所有二次曲线的球形螺纹加工。
Various NC programs to machine sphericity thread form based on ellipse contour are developed using macro programs. This method can be used for the contour machining of all types of conic.
同时它还能精确表示圆弧、椭圆弧等二次曲线，推广到空间即可以表示旋转曲面。
Also the curves can express the circle arc and ellipse arc and can construct rotate surfaces.
研究了一个奇异的、次临界指数的半线性椭圆方程。
A semilinear elliptic equation with singular and subcritical exponent is studied.
采用化学原位聚合技术和套管法二次预制棒拉丝技术，成功制备了椭圆芯微结构聚合物光纤。
A kind of microstructured polymer optical fiber with elliptical core has been fabricated by adopting in-situ chemical polymerization technology and the secondary sleeving draw-stretching technique.
然而，因为行星的椭圆轨道，这一个次时期对精确的5日历数年不是相等的，在太阳的周围基于地球的轨道。
However, because of the elliptical orbits of planets, this time period is not equal to an exact 5 calendar years, which is based upon the Earth's orbit around the Sun.
这类不连续数值方案被应用到随机椭圆方程中好像还是第一次。
To the best of my knowledge, it seems that it is the first time to apply the local discontinuous Galerkin method to the stochastic elliptic equation.
该方法利用闭合曲线的傅立叶级数表示的直流分量和一次分量实现对闭合曲线的椭圆拟合，可以避免通常椭圆拟合方法中的矩阵求逆问题。
The method USES the DC component and the first harmonic of a curve's chain code expressed by Fourier series to fit the curve, avoiding the inverse calculation of an array used in general methods.
讨论了二次指数发生器在椭圆曲线上模拟所生成的序列的分布情况，证明了此类椭圆曲线序列是渐近一致分布序列。
We consider an analogue of the quadratic exponential generator over an elliptic curve, which may produce sequences with asymptotically uniform distribution.
摘要本文利用次线性项在零点附近的凹性和可积性，用移动平面法给出了一类次线性椭圆方程正解的对称性。
With the concavity and integrability of sublinear terms near zero, the symmetry results for a class of sublinear elliptic equations are given by making use of the moving-plane method.
用临界点理论中的极小极大方法得到了次线性椭圆方程Neumann问题多重解的存在性。
The existence of multiple solutions is obtained for Neumann problem of sublinear elliptic equations by the minimax methods in the critical point theory.
考虑一类对角型椭圆组，它的非线性项关于未知解的梯度为二次增长。
Consider an elliptic system in diagonal form of which the nonlinear terms are of quadratical growth respect to the gradient of the unknown solution.
二次调质后，堆芯段筒体锻件产生了椭圆变形，为了不影响锻件已有性能，采用冷校形加去应力回火方法进行校正。
In order to keep the property of forging pieces which they already have, calibrating in the way of cold correcting the shape with stress release and tempering could get a better result.
夏鸾翔是晚清较早研究微积分的中算家，据其《致曲术》、《万象一原》，可知他在二次曲线求积问题上得到了比较全面的成果，有的已超过《代微积拾级》，某些成果近似近代的椭圆积分。
This paper discusses Xia's achievements on the integral problem about quadratic curve, some of which were similar to modern elliptic integral and surpassed the level of Dai-wei-ji.
研究了二次抛物线型的GRIN球透镜的光线轨迹方程序；得出其轨迹为椭圆曲线及一些重要结论。
At last, the author obtained the equation of ray trace in the GRIN ball lens with the index profile which is quadratic and drew some important conclusions.
这是我第34次，也是最后一次在白宫椭圆形办公室向你们讲话。
This is the 34th time I'll speak to you from the 1 Oval Office and the last.
本文提出了由一条二次曲线和与该二次曲线不共面的两条异面直线为导线，与该三导线均相交的直线轨迹是一个直纹四次曲面，并讨论了二次曲线分别为椭圆、双曲线和抛物线时，形成的曲面的形状特征。
In this paper, it is presented that the locus of a line crossedwith each of two guide lines and a guide conic not being on a commonplane is a ruled surface of fourth order.
本文针对带有间断系数的三维椭圆问题，讨论任意四面体剖分下的二次拉格朗日有限元方程的代数多重网格法。
In this paper, we consider a quadratic Lagrangian finite element equation arising from discretizations of 3d elliptic problem with jump coefficients under any tetrahedral partition.
本文用两次冲量法给出了沿双共切椭圆轨道实现从一圆轨道向另一圆轨道转移的最优方案，并考虑到地球扁率造成的轨道摄动。
The optimal scheme is given for the dual-tangential transfer between two circular orbits by dual impulse method. The orbit perturbation as a result of the Earth's flattening is considered.
本文用两次冲量法给出了沿双共切椭圆轨道实现从一圆轨道向另一圆轨道转移的最优方案，并考虑到地球扁率造成的轨道摄动。
The optimal scheme is given for the dual-tangential transfer between two circular orbits by dual impulse method. The orbit perturbation as a result of the Earth's flattening is considered.
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