What is the meaning of the twilight mountains in Bishan is still covered by the twilight mountains?

Dark colored mountains, travelers were returning home, looking at the end of the world, looking into the distance, in front of the green mountains blocking the line of sight, behind the green mountains there are a bunch of light mountains. The metaphor is that the journey home is far away.

The meaning of the original article is this:

People say that the setting sun is the end of the world, look at the end of the world is not home.

I hate the fact that the mountains are so far away from each other, and the mountains are still covered by the mountains of twilight.

The first time I saw this was when I was a student.