What are the last two lines of Langtaosha's poems galloping?

The first song of "Nine Poems of Langtaosha". The first two sentences of the poem describe a magnificent picture that comes from the horizon and gallops thousands of miles.

Jiuqu wrote the twists and turns of the Yellow River in an exaggerated way.

"From Tianya" vividly depicts the long history of the Yellow River, which is similar to the sentence "How does the water of the Yellow River move out of the sky and into the ocean, never to return" in Li Bai's "Into the Wine".

The last two sentences use Zhang Qian's allusions to find the source of the river for Emperor Wu and the Cowherd and the Weaver Girl across the Milky Way, galloping imagination and expressing that he will face the wind and waves and go upstream in the yellow sand of Wan Li until he reaches the home of the Cowherd and the Weaver Girl, which shows the poet's heroic spirit.

So the last two sentences are galloping imagination!