What is Du Fu's poem about Li Longji period?

In the poem "Twenty-two Rhymes for Wei Zuocheng", Du Fu called the "Lord" the emperor of the dynasty: he was eager to reach out. Twenty-two rhymes are dedicated to Zhang Qian. Wan Kun didn't starve to death, and the Confucian crown leaked out. The son-in-law tried to listen, and the son-in-law asked Chen. Just yesterday's Youth Day, I saw the ambassador in advance. Reading has broken thousands of volumes, and writing is like a god. Empower the enemy with materials and build a home with poetry. Li Yong seeks knowledge, and William Wang is willing to be a neighbor. Boasting to be quite outstanding, Li Deng wants Jin Lu. To the monarch, Yao and Shun, and then make the customs pure. This idea is actually suppressed, and the songs are not hidden. Riding a donkey for 30 years, traveling and eating jinghua spring. At the door of the rich, dusk carries the dust of fat horses. There are broken cups and cold roast everywhere. The Lord has seen the sign for a while, but he is eager to expand it. The green ghost has wings, but no vertical scales. I am ashamed of my father-in-law, and I know his father-in-law is true. Every time I go to Bailian, I recite new beautiful sentences. Stealing gong, it is difficult to be poor in Yuanxian. How can you not be satisfied? You're just wandering around Today I want to go to the sea in the east and Qin in the west. I still pity Nanshan and look back at Weibin in Qing Dynasty. I often plan to sign up for a dinner party, Minister Kuang Huaici. Bai Ou is not strong, but Wan can be tamed. Lord: It refers to Xuanzong of the Tang Dynasty. Qing: Not long ago. See the sign: called up. I (of course: suddenly. Desire and extension: I hope to show my talent and realize my desire to be a gentleman.