"It's as graceful as Youlong if it's amazing." It means: flying like a wild goose, graceful like a swimming dragon.

The source of this sentence is Cao Zhi's Ode to the Goddess of Luo in the Han Dynasty.

I have excerpted a paragraph of the original text containing this sentence for your reference:

I told you: its shape is also amazing, and it is as graceful as Youlong. Rongyao Qiuju, Hua Mao Chunsong. Beards and beards are like light clouds covering the moon, and they float like snow flowing in the wind. Looking at it from a distance, if the sun rises in the morning glow; If you are forced to examine it, it will burn like a wave. If you are fine, you can trim the fit. If the shoulders are cut, the waist is as good as the element. The neck is extended and the neck is beautiful, and the quality is exposed. Fangze is not added, and lead is rich. The clouds are towering, and the eyebrows are trimmed. Red lips are bright outside, white teeth are fresh inside. Bright eyes are good at looking forward to it, and bad eyes are auxiliary to the right. You look gorgeous and easy, and you are quiet and relaxed. Tender feelings, charming in language. Amazing clothes are outstanding, and the bone image should be mapped. The splendor of wearing a sweater is the splendor of Yao and Bi. Wear gold and jade jewelry, embellish pearls to show off your body. To practice the writing of a long journey is to drag the fog lightly. The fragrance of the tiny orchid lingers in the corner of the mountain. So suddenly how longitudinal body, to roam to play. Leaning on the left, leaning on the laurel flag on the right. I am busy with my wrist, and I adopt the mysterious wisdom of turbulent wrasse.

This article is translated into vernacular Chinese as follows:

I told him that she was like a swan flying in surprise, graceful as a swimming dragon. Radiant as chrysanthemums in autumn, plump as pines in spring breeze. She is like a light cloud cage moon, floating and drifting like returning air and spinning snow. Looking at it from a distance, it is as clear as the rising sun in the morning glow; Looking at it closely, it is as beautiful as a new lotus blooming between green waves. She has a moderate figure, height and height, narrow shoulders, thin waist and fair skin on her beautiful neck. Neither fat nor powder, the bun is towering like a cloud, the long eyebrows are curved and slender, the red lips are fresh and moist, the teeth are white, a pair of shining eyes that are good at looking around, and two sweet dimples under the cheekbones. She is elegant and charming, gentle and demure in manner, soft and smooth in manner, and graceful in words. Luoshen's costume is gorgeous and peerless, and his physique is the same as that painted on the picture. She is dressed in bright Luo clothes and exquisite jade. Wearing gold, silver and jade jewelry, decorated with shining pearls all over. She lingered on the hillside with long-distance shoes decorated with patterns and a misty skirt, faintly emitting the fragrance of orchids. Suddenly, he floated lightly and played, leaning against the colored pheasant on the left and shaded by the laurel flag on the right, reaching out on the beach and picking black grass by the water.

It may be difficult to understand the meaning only by reading the article, so it is better to understand it by combining the creative background of the article at that time:

According to the preface, Cao Zhi's poem was written after he entered Luoyang, the capital of Wei Wendi in the third year of Huang Dynasty (222), and passed through Luoshui on his way back to Juancheng, a fief. At that time, shortly after Cao Pi became emperor, he killed Cao Zhi's close friends, Rockett and Ding Kuang. Cao Zhi himself played "Drunk, Slow, Threatening Ambassadors" for the supervisor of the country after he left China, and was demoted to Hou of Anxiang, later renamed Hou of Juancheng, and then made King of Juancheng.

Now that we are talking about this, let's appreciate and comment on this article:

Cao Zhi has made outstanding achievements in poetry and ci fu creation. His fu inherits the tradition of lyrical small fu since the Han Dynasty, and absorbs the romantic spirit of Chu Ci, which has opened up a new realm for the development of ci fu. Luo Shen Fu is an outstanding work in Cao Zhi's Ci Fu. The author describes the sincere love between man and god in a romantic way through a dreamy realm, but he is disappointed and separated because of the "different ways between man and god".

There are three main features of this Fu:

The first feature is rich imagination. The author set out from Luoyang, the capital, and returned to Juancheng, a fief in the east. On the way, on the edge of Luochuan, I stopped to drink horses, and when I strolled in Yanglin, I saw Fu Fei, the goddess of Luo. This is imagination. Her posture is swaying like a startled wild goose, graceful and gentle like Youlong in the water, more delicious and gorgeous than Qiuju and Maosong, as beautiful as sunrise, as pure as hibiscus and absolute beauty. Then he had an affection for her, sent her a message from Shuibo, and sent Yu Pei a promise. However, her holiness and nobility made him afraid to expect anything. Luo Shen was finally moved by his true feelings, met him and poured out his feelings. But in the end, because of the different ways of man and god, there is no hope of combining them, so I bid farewell to them. The imagination is gorgeous, and the romantic and mournful feelings are light and unchanging, which makes people sigh and feel melancholy. However, this imagination is not bizarre, so the fu is written with feelings of Song Yu's two fu poems, Goddess Fu and Gaotang Fu.

the second feature is that the words are gorgeous but not impetuous, and the fresh air is refreshing. Pay attention to the arrangement of couples, antithesis, temperament, and the language is put in order, concise, vivid and beautiful. There is no match for the conception of Han Fu based on materials. This pen is the creation of an atmosphere that is plain and strange. Just as Tao Yuanming's Peach Blossom Garden narrates the beginning of Wu Lingren's boat trip, the wonderland appears without warning beforehand. But at this moment, the author suddenly witnessed an unforgettable scene: a pretty woman, Luo Shen, appeared. Then the author tries to describe the beauty and pain of Luo Shen as if he wanted to compete with Song Yu's Wushan Goddess. Then writing Luo Shen leads the crowd to leave, which is similar to Qu Yuan's "Lisao" to describe the scene of the tragic death of the protagonist.

the third feature is vivid description, which is combined with metaphor and contrast. The intricate changes are ingenious and appropriate, giving people a sense of grandeur without annoyance, beauty without shock, and making people feel like watching a wonderful Danqing, in which the characters are flesh and blood, without making people feel a sense of nothingness. When describing Luo Shen's figure, facial features, posture, etc., it conveys Luo Shen's appearance of sinking fish and the capacity of falling geese. At the same time, there is a fresh and noble "clear water produces hibiscus, and natural carving". In the description of Luo Shen's manner when he met him, people feel that the Sri Lankan people emerge in front of them and are graceful. As for Luo Shen's description when he broke up with him, "the screen is gathering wind, the river is quiet, Feng Laiming drums, and Nuwa Qingge." The sincerity and purity of love, everything is so beautiful, so that after parting, people go to the heart to stay, and their feelings continue. The beautiful image of Luo Shen and the scene when they met and knew each other are vivid, romantic and bitter, and their minds are uneasy and they can't bear to leave.

The predecessors have highly appraised the ideological and artistic achievements of the Ode to Luoshen, and the most obvious thing is that it is often compared with Qu Yuan's Ode to Nine Songs and Song Yu's Ode to Goddess. In fact, Cao Zhi's Fu has both. It has the strong lyrical elements of Xiang Jun and Mrs Xiang, and at the same time it has the exquisite description of female beauty in Song Yu's Fu. In addition, its plot is complete, its technique is changeable and its form is meaningful, which is inferior to previous works.

Finally, I think it is necessary to introduce the author of this article:

Cao Zhi (192-232), Zi Zijian, Pei Guoqiao (now Bozhou City, Anhui Province). Cao Wei, a famous writer in the Three Kingdoms, was a representative of Jian 'an literature. The son of Cao Cao, Emperor Wudi of Wei Dynasty, and the brother of Cao Pi, Emperor Wendi of Wei Dynasty, used to be King Chen before his death. After his death, posthumous title "thought", so he was also called King Chen Si. Later generations called him "Three Caos" together with Cao Cao and Cao Pi because of his literary attainments, and Xie Lingyun, a writer in the Southern Song Dynasty, even commented that "there is only one stone in the world, and Cao Zijian monopolizes eight fights". Wang Shizhen commented that poets in the two thousand years since the Han and Wei Dynasties were called "immortals", and Cao Zhi, Li Bai and Su Shi were three people.