线条的方向表示恒星运动的方向；
The direction of the line indicates the direction of the star's motion;
但地球相对于太阳运动，太阳相对于某些其他恒星运动，等等。
But the earth is in motion relative to the sun, the sun is in motion relative to some other star, and so on.
所以，你的意思是因为恒星运动么？为了铭刻于心我需要好好追随你的思路。
So, what do you mean by interstellar activity? Keeping in mind I need to follow what you are talking about.
应用推荐