The prosperity of some things must be accompanied by the decline of other things. When autumn comes on September 8th, I will kill hundreds of flowers after they bloom. This is a poem in Tang Dynasty poet Huang Chao's "Bu Di Hou Fu Chrysanthemum". Among them, September 8th: September 9th is the Double Ninth Festival, and there is a custom of climbing high to admire chrysanthemums. Saying "September Eight" is meant to rhyme. Kill: vegetation withers. The meaning of this poem is that when the Double Ninth Festival comes in September in autumn, the chrysanthemums will bloom and other flowers will wither. This sentence contains a natural law, which means that the prosperity of some things must be accompanied by the decline of other things, which is inevitable.