This is a test site for poetry appreciation. The understanding and appreciation of poetry mainly tests students' ability to understand and appreciate poetry. This kind of topic often appreciates poetry from the aspects of content theme, language expression and technique. Ask students to understand the emotion, reason and scenery described and expressed in poetry; At the same time, grasp vivid words from the language; More importantly, we should learn to appreciate poetry from the perspectives of borrowing scenery to express emotion, supporting things to express emotion, and combining reality with reality. Here, the poem expresses the poet's yearning for his relatives and hometown in Chang 'an in an exaggerated way.