What is the performance of mid-tail combined transport in Du Fu's "Climbing the Building"? What kind of feelings did the poet express?

1, followed by "However, in the twilight, I feel sorry for the sorrow of an emperor who has long disappeared. I am singing the song that his prime minister sang before he disappeared in the mountains."

Liu Chan, the late ruler, made the country perish and was sacrificed, suggesting that Tang Daizong could revive the Tang Dynasty by reusing eunuchs and thinking about fish, which is really worrying.

The poet's ambition to save the world is empty, but he can't serve the country, so he has to sing his father's songs to show his respect. Comparing Zhuge Liang with the former master shows admiration for Zhuge Liang and contempt for the former master, that is, using contrast. Of course, there is also the meaning of borrowing the ancient to satirize the present.