This is a deep patriotic feeling. These groups of images constitute the rich connotation of homesickness and make it more obvious. Feelings are getting stronger and stronger, and the theme is getting deeper and deeper.
It is with this structural form that the author, like the repetition of the main theme in music, repeats the pain of separation in one chant and three sighs, vividly rendering homesickness. So critics say this poem is extremely beautiful in structure and music.