英语语法分析

If I make the total energy positive, it's not an ellipse.

如果我让总能量为正，它就不是一个椭圆了。

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。

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。