1. Man is not a circle with a single centre; he is an ellipse with a double focus. 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。
2. If this is an ellipse around the Earth, this would be perigee and this would be apogee. 如果这是一个围绕地球的椭圆形，那么这是近地点，这是远地点。
3. The main axis of the planet's orbital ellipse shifts each time when it goes around the sun. 当行星绕太阳运行时，其轨道椭圆的主轴每次都会改变。
4. One characteristic of Earth's orbit is its eccentricity, the degree to which the orbit is an ellipse rather than a circle. 地球轨道的一个特点是它的离心率，也就是轨道是椭圆而不是圆形的程度。
5. Cutting the cone at various angles gives you various shapes of ellipse. Until the angle of your cut exceeds the angle of the side of the cone. 从侧面不同角度切割圆锥，你便会得到不同的椭圆，直到你的切割角度超过圆锥体侧边的角度。
