In the couplets, the sentence "Seeing geese fly thousands of miles after autumn" looks up at the moving scene from a distance visually, and the sentence "Smelling a thousand clothes in the middle of the month" writes the moving scene from the perspective of hearing.
Audio-visual combination, dynamic and static contrast, pitch interaction, far-near contrast, orderly hierarchy; Because the clouds return, the sky is clear, because the sky is clear, so you can see the "water is thin", because there is no cloud in the sky, so you can see the geese in Wan Li, and when you see the geese returning home, your heart is desolate and cold, causing people in the distance to make the sound of cold clothes. The description of scenery accords with people's cognition, with clear causal logic and smooth and natural thinking.
How to express the poet's feelings in the last four sentences
The phrase "long pity" shows the poet's infinite sympathy and pity for his friends in the two places. The phrase "long separation" not only reflects the poet's loneliness without friends, but also his deep yearning for two friends who are far away from home and his sincere desire to meet each other as soon as possible. The phrase "exploit the topic" focuses on friends who are traveling abroad, expressing their feelings of being in the same boat and their deep understanding and sympathy for their difficult situation.