The upper and lower sentences are straightforward, but the syntactic structure is the same. Spring cicadas turn against wax torches, turn to ashes when they die, and dry silk turns into tears. Meet the antithesis requirements of metrical poetry.
These two lines express a woman's undying loyalty to love. Another extension is to express a person's noble sentiments.
In the sentence "Spring Silkworm", firstly, silk is used as a symbol of family affection, and the feelings of love (silk) can't be spun like spring silkworm. But this alone is still not enough to express the intensity of feelings, so I tried my best to express my persistence in love until my death. At this point, the expression of love has reached the extreme, and it seems that there is no progress. However, it is very common for the poet to compare his tears of love to a burning wax torch. A word "tears" tells the poet's persistent and hopeless inner world. Painful feelings are driven by "tears", and then the wax torch turns to ash, and the wax tears begin to dry up, which symbolizes the persistence of love, although it is difficult, until the end of life. This is a genius move. In these two sentences, the poet, through clever homophonic metaphor, wrote the hero's endless lingering love and conscious sacrifice spirit suffering from infatuation, which was touching and made the tragedy laid by the first couplet more intense. When quoted by later generations, it goes far beyond the scope of love and is often used to refer to the persistent attitude towards a certain cause.
Become a beautiful sentence that has been passed down through the ages.