The author focuses on the sufferings brought to the people when Jin Bing invaded Jiangxi 40 years ago, and thus thinks that the occupied Central Plains has not been recovered for a long time, and twists and turns reveal the corruption and incompetence of the ruling group in the Southern Song Dynasty. "Looking at Chang 'an in the northwest, the mountains are pitiful" vividly reflects the author's mood. "Castle Peak can't cover up, after all, it flows eastward", which is delicate, profound, novel and poetic. These two sentences show that Qingshan can block people's sight, but it can't stop people's concern and yearning for the occupied areas of the Central Plains. It is suggested that the ruling clique in the Southern Song Dynasty can set up many obstacles to split the motherland in half, but it cannot obstruct the people's strong desire to reunify the motherland. The last two sentences reflect the author's grief and indignation with the wailing of partridges.