It's always negative. Okay, later in the course we will cover elliptical orbits.

总是负的，好吧，以后的课，我们会讲椭圆轨道。

youdao

It's always negative. Okay, later in the course we will cover elliptical orbits.

总是负的，好吧，以后的课，我们会讲椭圆轨道。

youdao