Ambition: Based on the whole poem, explain what kind of mood the author expresses in his description of the autumn sounds in the mountains and fields.

This poem is about the autumn scenery of the mountains and fields. The whole poem reveals the loneliness and depression in the description of the bleak and quiet scenery, expressing the poet's melancholy and lonely feelings. "Looking at the dusk in Donggao, where can I rely on when I move?" Gao is a place by the water. Donggao refers to a place in Longmen, Jiangzhou, his hometown. After he retired to seclusion, he often traveled to Beishan and Donggao, calling himself "Donggaozi". "Yiyi" means wandering. "Where can I rely on?" is adapted from Cao Cao's "Dan Ge Xing", which means "the moon and stars are sparse, the black magpie flies south, and it circles the tree three times, and there is no branch to rely on", expressing the bored and hesitant mood.