Appreciation: "A cloud rose between the light of heaven and me, hiding his city from my melancholy heart." These two poems have profound implications. Chang 'an is the seat of the imperial court, and the sun is the symbol of the emperor. Li Bai's two poems imply that the emperor is surrounded by evil spirits and he can't serve the country. His mood is very painful. The word "Deng" in the poem "See Chang 'an" is touching and sad, which means fable and has endless aftertaste.