[College Entrance Examination] How can we accurately grasp the theme of poetry

According to the theme of the poem, it is divided into: 1: nostalgia for history, keywords such as "Great Wall", "Liu Ying" and "Qiangdi"; 2. Pay attention to keywords (chrysanthemum, plum blossom, bamboo,); 3. border defense; 4. Landscape pastoral (Wuliu, Dongli, Sanjing, etc. ).