These two sentences are usually interpreted as: flowers and birds are originally entertainment things, but because they are sentimental and hate to say goodbye, they make the poet cry when he sees them. Another explanation is: using flowers and birds as human beings, they feel sad when they say goodbye, the flowers shed tears, and the birds are frightened. Although the two poems are different, their spirits are interlinked. One touches the scene and empathizes with the object. The poet touches the scene and empathizes with the object, expressing his feelings about the time and the world. In July of the fifteenth year of Tianbao's reign (756), Emperor Xuanzong of the Tang Dynasty, the Anshi rebels captured Chang'an. Suzong ascended the throne in Lingwu and changed the Yuan Dynasty to De. On his way to Lingwu, Du Fu was captured by the rebels and brought to Chang'an. He wrote this poem the following year (the second year of Germany). The poet witnessed the fall of Chang'an's flutes after the fall, and was deeply homesick after experiencing adversity. He couldn't help but sigh with emotion. The first and second couplets of the poem describe the devastation of the Spring City, full of sighs; the third and fourth couplets describe the situation of missing relatives, full of feelings of separation. The whole poem is calm and subtle, sincere and natural, reflecting the poet's love for the motherland and his feelings for his family. Modern scholars such as Xu Yingpei and Zhou Rongquan commented on this poem: "The meaning is thorough but straight, the scenes are comprehensive but not dissociated, the emotions are strong but not superficial, the content is rich but not complicated, the rhythm is rigorous but not rigid." This comment is quite interesting. For appropriateness. "A letter from home is worth ten thousand dollars" is also a famous saying that has been passed down through the ages.