我现在要进入一个椭圆形轨道，因为新的速度已经，不是圆形轨道中的速度。
I now go into an elliptical orbit because the new velocity is no longer the right velocity for a circular orbit.
同样的，第五个方程序，中的速度同样，会随时间改变，因为这是椭圆形轨道。
Also that velocity, v, in that equation number five will also change with time because it's an elliptical orbit.
这种拉伸了的椭圆轨道意味着：相较于地球距太阳最远的七月份，一月份时，地球更靠近太阳，并且围绕太阳的公转速度更快。
The elongated orbit means that Earth goes faster around the sun in January, when it is closest to the star, than it does when it is farthest away from the sun in July.
这种拉伸了的椭圆轨道意味着：相较于地球距太阳最远的七月份，一月份时，地球更靠近太阳，并且围绕太阳的公转速度更快。
The elongated orbit means that Earth goes faster around the sun in January, when it is closest to the star, than it does when it is farthest away from the sun in July.
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