(2) The first couplet expresses the author's worries through description and metaphor. By describing that the rain stayed up all night until dawn, the profile implies that the author stayed up all night, indicating that he was worried for a long time and his heart was always entangled with sadness; Metaphorically comparing "hundred worries" to the vibrant grass in the rain shows sad confusion.
(3) The neck joint is from the visual angle and the auditory angle. The early crow gathered in the tree was seen by the author; The dull drums are what the author heard. These scenes are bleak and depressing, conveying the author's gloomy and lonely mood.
Feng Xue, a scholar, is not proud of his official career because he is arrogant, ambitious and worried by powerful people. The ups and downs of fate can be understood as the ups and downs of one's own destiny with the political turmoil, aiming at expressing one's poor fate and the bumps encountered.