人并不是只有一个圆心的圆圈；他是一个有两个焦点的椭圆。
Man is not a circle with a single centre; he is an ellipse with a double focus.
开普勒曾表明，地球的轨道是一个椭圆，这个椭圆有两个焦点，太阳在其中一个上。
As Kepler showed, the Earth's orbit is an ellipse, with the sun at one of the two focal points.
它是椭圆型的焦点。
行星的轨道是以太阳作为焦点之一的椭圆。
The orbits of the planets are ellipses with the sun at one focus.
椭圆越扁平，两焦点之间的距离越远，每个焦点离中心的距离也越远。
The flatter the ellipse the farther apart the foci and the farther each focus the center.
利用解析函数的性质，通过反双曲余弦计算出了由共焦点椭圆导体柱面组成的电容器内电场和单位长度的电容，并对结果作了进一步讨论。
The electric field and capacitance of a confocal elliptic capacitor are calculated by the inverse hyperbolic cosine analytic function, and discussion on them is performed.
太阳能电池芯片设置于椭圆球壳状反射镜的两焦点的至少其中之一上。
The solar battery chip is arranged on at least one of two focal points of the elliptical spherical shell shaped reflecting mirror.
球面上共焦点之椭圆、双曲线，在球心投影中仍投影成共焦椭圆、双曲线。
The cofocal ellipse and hyperbola of spherical surface will also be projected into the cofocal ellipse and hyperbola in gnomonic projection.
第一定律（轨道定律）：所有行星都沿各自的椭圆轨道运动，太阳在该椭圆的一个焦点上。
The orbit of every planet is an ellipse with the Sun at a focus.
焦点之间的中点为中心。椭圆的一个特性是：连自一个焦点的直线边界反折会通过另一个焦点。
The flatter the ellipse, the farther apart are the foci, and the farther each focus is from the center .
焦点之间的中点为中心。椭圆的一个特性是：连自一个焦点的直线边界反折会通过另一个焦点。
The flatter the ellipse, the farther apart are the foci, and the farther each focus is from the center .
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