The first expression: the vastness of the desert in the eye-catching beacon smoke rose up, the long Yellow River on the west of the sun round

The second expression: the vast expanse of the desert, the yellow sands, dusk orange-red sunset convergence of light, quietly residing in the sky, reflecting the ripples of the river flashing white, the desert rose a white beacon smoke, straight up into the sky.

Sunset, would have been easy to give a person a sentimental impression, here with a "round" word, but gives a person a kind and warm and pale feeling. A "round" word, a "straight" word, not only accurately depicts the desert scene, but also expresses the author's deep feelings.