The vastness of mountains and rivers, the splendor of fireworks, another year, what does it mean to be thousands of miles away?

The world of fireworks means the secular atmosphere in the world.

Chanjuan refers to the moon or flowers, and Chanjuan is thousands of miles apart, which means enjoying the moon.

So the whole sentence means that the world is so big, the mountains and rivers are so far away and vast, and there is a secular atmosphere everywhere. After another year, I am still thousands of miles away from my lover, so I can only admire the moon and send my homesickness.