The so-called "xing" means "saying something else first so that the words can be sung".
Bixing, simply put, is: talk about the content of the object to be said first, then talk about the object to be said, that is, talk about something else first, then talk about something else.
For example, the phrase "Guan Yu is in Hezhou" is both exciting and comparative. The pheasant dove is docile by nature and can be compared with the demure of a lady; The pheasant dove is a common bird in "Hezhou", which can remind people of the daughter who often comes to the river to collect pheasants; "Guan Guan" is the voice of male and female ensemble, which can arouse the feeling of "gentleman" missing "autumn"
Metonymy, as its name implies, means borrowing one thing to replace another. Generally speaking, metonymy is a rhetorical method of borrowing people or things that are closely related to it, rather than directly speaking or writing articles.
For example, "the green hills on both sides of the strait are opposite, and the lonely sails come from the sun." Replace the boat with a part of the sail.