What kind of emotion does this ancient poem express when climbing mountains?

Climbing: In the sharp wind from the vast sky, apes are sobbing, and birds fly home on the clear lake and white sand beach.

The endless trees are rustling leaves, and the Yangtze River is rolling unpredictably.

Li in the sad autumn scenery, a wanderer all the year round, lives alone on the high platform in today's illness.

After all the hardships and hatred, the white hair is full, and the wine glasses are damaged.

This poem was written by Du Fu in Kuizhou in the second year of Dali (767). The whole poem expresses the poet's complex mood of wandering, illness and loneliness for many years, which is impassioned and touching. After the "An Shi Rebellion" was pacified, the country did not restore peace and tranquility as Du Fu expected, and the Tang Empire was plagued by the hegemony of local buffer forces and the invasion of Tubo foreign enemies. Going upstairs in spring and looking into the distance, the poet's mood is particularly depressed. In spring, nature has returned to the earth, but people in the whole country still can't see the spring poems. What he saw was "how difficult it is for ten thousand people", especially the bandits in the western hills are rampant. Poets have to worry about the future of the country. When resenting the Tubo invasion, he once again expressed his deep admiration for Zhuge Liang. This kind of admiration also contains the expectation of reality, longing for a saint who is slightly like Zhuge Liang in literary talent and martial arts to assist the Tang Empire. Looking back on Zhuge Liang's unfinished business, I can't help sighing. This regret contains anxiety about reality, and Zhuge Liang's tragic ending seems to indicate the difficulty of reality.