The first couplet was inspired by the sound of cicadas. "Hungry because of the pure heart" cicadas are aloof from trees, absorbing wind and drinking dew, so they can't stop. I am poor because I am lofty. "You sang all night in vain", and the cicada's cry came from "not enough to eat", full of sadness and hatred. This kind of singing can't get it out of trouble, so it's in vain. Because I was poor, I expressed my feelings to powerful people, hoping to get their help, but such feelings were also in vain. Cicada is heartless, and there is no such thing as "dissatisfaction" and "dislike". In fact, it is the poet himself who is "dissatisfied" and "disgusted". It's just that the poet expresses this feeling on cicada, which shows the implicit beauty of China's poems.
Zhuan Xu took unsuccessful feelings one step further and reached the climax of lyricism. The cicada's chirping has been sparse, almost broken by Wu Geng, but the leaves of a tree are green, and they are not sad for the cicada's "sparse", which seems so heartless. Another feature of chanting poems here is irrationality and wonder. The cicada's "want to break" has nothing to do with the green of the tree, but the poet blames the indifference of the tree. In fact, he blamed the powerful for refusing to help, which made his embarrassing experience unchangeable. So it seems logical.
Throw away cicadas and turn to yourself to make your feelings clearer. "Yes, I am like a driftwood." A poet who works as an aide in various places, a small official, runs around like a log drifting around in the flood. This unstable life makes him homesick. At the same time, "the countryside will be destroyed", and the cause of homesickness has added another layer. These two sentences seem to have nothing to do with the cicada singing above. In fact, it is because of his humble position as an official that the poet is "hard to find his place" and "hard to make his voice heard", and the talented person is "ruthless", which makes the poet move towards seclusion.
The tail couplet belongs to chanting cicadas, anthropomorphizing cicadas, echoing the beginning and taking care of them from beginning to end. The cicada song reminds me that a small official in this similar situation might as well go back to his hometown to farm.
Both of them are devoted to chanting cicadas, but because of their different identities, circumstances and temperament, they present such different faces and constitute such artistic images with distinctive characteristics. The above three poems can be called three unique poems of chanting cicadas in the literary world of Tang Dynasty.