清单3显示了如何绘制线、矩形、圆(使用椭圆)及椭圆。

Listing 3 shows how to draw lines, rectangles, circles (using the ellipse), and ellipses.

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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.

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接着开普勒提出了他的定律，他说行星基本上是绕太阳作椭圆运动，它们在椭圆上有特殊的运动规律。

And then Kepler came with these laws that said basically that planets move in an ellipse around the sun, and that they move in a very specific way along that ellipse.

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By putting the two together, out comes the elliptical motion of the planets.

将这两个式子联立,就得到了行星作椭圆运动的方程

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and they tell you the answer, which will be some elliptical motion.

他们会告诉你答案,行星会做椭圆运动

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Well, it was not very hard for me to draw this red blood cell here, it's just an oval, and one reason I draw it like an oval, is that that's basically what it looks like if you look at it.

我可以很容易的画出,一个血红细胞,就画个椭圆足矣,因为它看上去就是这个样子的

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