This poem first describes the cicada's situation, then jumps directly to his own experience and expresses his feelings directly, and finally returns to the cicada naturally, with harmonious beginning and end and coherent meaning. The whole poem begins with cicada and ends with cicada, which is well organized. The description of cicada and the poet's affection are skillfully expressed together and integrated into one, which is a masterpiece of supporting things and chanting things. Poets express their noble character by drinking cicadas and dew, which is a typical example of praising people with things.
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The ancients believed that cicadas lived by eating and drinking dew, praised cicadas as a symbol of nobility, or used them to pin their ideals and ambitions, or used them as metaphors for their bumpy and unfortunate life experiences. The most famous is the Tang Dynasty poem "Three Musts".
The cicada in Yu Shinan's Cicada "without autumn wind" has become a confession for the poet to stand upright and clean and not be reused by external forces. Luo's "Chanting Cicadas", "The cicadas in the west sing, and the guests in the south think deeply", expresses their thoughts by singing cicadas, writes that the current situation is sinister, political dissatisfaction, and speech is suppressed.
Li Shangyin's "Cicada", "You are hungry because of pure heart, and you sing all night for nothing" is to associate his innocence with the purity of cicada, and people who sympathize with cicada associate themselves differently.
Baidu Encyclopedia-Cicada (one of the common images of ancient poems and songs)