Some critics of "Seeing Yuan Twenty Shores Xi" believe that "Yu Chao" plays an important role in this poem. Why do you say that? Please talk about your opinion.

Yu Chao did play an important role. First, Su Shi once commented that Wang Wei's poems and paintings are "paintings in poems and poems in paintings". This little poem can become a swan song through the ages, and it can't be separated from its fresh and hearty paintings, and Yu Chao, like such a finishing touch, washes away the stains and dust on the walls and willows in front of the guest house, which are blue tiles and green. Secondly, "Yu Chao" is also an emotional guide. "He stared at the bleak moon from his temporary palace, and the bell was heartbroken in the night rain", "I was sad, and the pavilion was late, and the shower began to rest", "The dusk was far from waking up, and it rained all over the sky". Rain is a tear in heaven, and the poet was already very sad when he said goodbye to his friends. How can he encounter this intermittent light rain again?