1, time background: Set the story background in a beautiful spring, the season when everything recovers.
2. Location background: Set the story background in a strange place after Su Shi left his hometown, which is his exile.
3. Emotional background: Describe Su Shi's feelings of missing his hometown and relatives when he left his hometown.
4. Inner background: Describe Su Shi's inner turmoil, full of thoughts, recalling the beauty of his hometown and the warmth of his loved ones in a foreign land, lamenting the passage of time, and his thoughts reverberating between the past and the present, expressing his hope and yearning for the future.