Expressing feelings: the book of letters mainly expresses "death without conquest", unfulfilled ambition, hero's regret, and the loyalty of "three strands of frequent" and "opening economic aid to the two dynasties"; By praising Zhuge Liang's achievements in the Northern Expedition, Book of Wrath reflects his frustration and sadness that he could not recover lost land and his desire to recover occupied rivers and mountains. Because of the different living environments of the two authors, Du Fu was displaced from place to place in the Anshi Rebellion, so I hope that a loyal minister like Zhuge Liang can reorganize the rivers and mountains, while Lu You did not think about the resentment and helplessness of serving the country brought about by the Northern Expedition because of his partial safety in the Southern Song Dynasty.
Performance: "Shuxiang" borrows scenery to express feelings and reminisces about the past; The book Anger is a metaphor for today.