The extended material "Ascending the Height" is a seven-meter poem written by Du Fu, a poet in the Tang Dynasty, in Kuizhou in the autumn of the second year of Dali (767). The first four sentences describe the scenery, describe the experience of climbing mountains, closely follow the seasonal characteristics of autumn and describe the empty and lonely scenery by the river. The first couplet is a partial close-up, and the couplet is an overall vision. The last four sentences are lyrical, describing the feelings of climbing mountains. Around the author's own life experience, they express the sadness of being poor, old and sick, and living in another country.