Wang Wei's famous sentences describing the scenery beyond the Great Wall

What is the famous sentence describing the scenery beyond the Great Wall in Wang Wei's To the Great Wall?

"The desert is lonely and straight, and the long river falls in yen.

It is about the strange and magnificent scenery outside the Great Wall after entering the frontier fortress. The picture is open and the artistic conception is magnificent. Wang Guowei nearby called this sentence "a wonder of the ages." The frontier desert is boundless, so the word "big" of "desert" is used. The frontier fortress is desolate and wonders. The smoke lit by the beacon tower is particularly eye-catching, so it is called "solitary smoke". A word "solitary" describes the monotony of the landscape, and a word "straight" behind it also shows its strength and perseverance. There are no mountains and trees in the desert, and the Yellow River flowing through it cannot express the poet's feelings unless a word "long" is used. Sunset, originally easy to give people a sentimental impression, uses the word "round" here, but it gives people a feeling of warmth and boundless. The word "circle" and "straight" not only accurately describes the desert scene, but also shows the author's deep affection. The poet skillfully blends his loneliness into the description of the vast natural scenery.