The writing technique of poetry, in professional terms, is its expression technique.
This poem is a masterpiece of the poet who touched the scene when he stayed at Qinhuai overnight. In the sigh of the land of the rise and fall of the Six Dynasties, there are feelings of worrying about the country and the people.
"Businessmen don't know how to hate their country, but still sing" backyard flowers "across the river."
Literally, these two poems seem to criticize the singer, but in fact, the poet feels the decline of state affairs in the late Tang Dynasty, and the world is getting worse, criticizing those rulers who are addicted to singing and dancing and "don't know" that the country will die.