Progress means that the goal is constantly advancing, the stage is constantly changing, and the vision is constantly changing.
The thickness of the background determines the height of the field of view.
Climbing Mount Tai's sunshine incense burner gives birth to purple smoke in a small world, and you can see thousands of waterfalls hanging from afar. On the high cliff, it seems to be thousands of feet high, which makes people think that the Milky Way has fallen from heaven to earth. ""There are thousands of spacious buildings, and all the poor people in the world are smiling! Suddenly I saw the house in front of me, and it was enough for me to freeze to death alone. "