The skills of comparison and creation have a long history in China. The Preface, China's first poem integrating The Book of Songs, said: "Therefore, poetry has six meanings: one is wind, the other is fu, the third is comparison, the fourth is pride, the fifth is elegance and the sixth is fu".
Among them, style, elegance and fu are the components of the Book of Songs. There are fifteen national styles, most of which are folk songs; "Elegance", including "Elegance" and "Xiaoya", is a work of "Talking about Abolishing Wang Zheng"; Odes, including Zhou Song, Truffle and Shang Ode, are music songs that praise Wang Dehe's sacrifice.
Fu, Bi and Xing are the ways to express the content of poetry. Zheng Xuan, a master of Confucian classics in the Western Han Dynasty, said: "Comparison" means "seeing the loss of today, dare not criticize, and take analogy"; "Xing" means "seeing the beauty of today is too flattering and persuading it with kindness".
In other words, "Bi" and "Xing" were used by ancient people to satirize and praise current events. This stinging beauty is not straightforward, but is sung around the corner with euphemistic metaphors. Since then, there have been many interpretations of Fu, Bi, Xing and Xing.
In the Southern Song Dynasty, Zhu explained this in his Biography of Poetry: "The giver is the true one of Chi-nese medicinal; Compare this thing with another thing; Xing, say something else first, in order to cause the lyrics to be sung. " Since then, although this explanation is inconsistent, most scholars and poets have adopted Zhu's theory.