Fu: It is a way to express things directly. Zhu, a scholar in the Song Dynasty, said in the Notes on Poems: "The giver must tell the truth." For example, Ge Tan and Slug in The Book of Songs used this technique.
Bobby: It's a figurative way to describe things and express thoughts and feelings. Liu Xie said in "Wen Xin Diao Long Bi Xing": "And what is Bi Ye? Cover things with attachments and threaten to cut them off. " Zhu said, "If you compare, you can compare this thing with another." For example, books in The Book of Songs, such as Cats and Storytelling, are written in this way.
Xing: It's a way to make things interesting, that is, to use the beginning of things to describe things and express thoughts and feelings. In the Tang Dynasty, Confucius said in "Mao Shi Zheng Yi": "Those who get the Tao are happy. Take the metaphor as an example. Those who quote plants, birds and beasts in poetry and prose are happy. " Zhu pointed out more clearly: "If you are interested, you should say something else first to arouse the words you are reciting." For example, Guan Ju and other articles in The Book of Songs used the expression of "Xing".