1, urging spring. Zi Gui (cuckoo) sings, and when spring is almost over, it will bring the poet the regret that "the flowers have fallen into the water and spring has gone".
2. Homesickness. This kind of birdsong sounds like "it is better to go home", which makes people who are stranded in other places and have no nostalgia for their careers miss their loved ones' homeland. This is also an appeal to those officials who wish to retire.
3. Because the legend of "Tears of Blood" also represents the pursuit of "unswerving determination".