What is intertextuality? How to apply intertextuality theory in the teaching of modern Chinese poetry in primary and secondary schools?

"Intertextuality" means that in a parallel phrase or clause, the meanings of the two parts are basically the same. For example, "the generals died in battle and the strong men returned in ten years" is not simply that all the generals died and the strong men came back, but that both the generals and the strong men experienced many battles, some died and some finally came back; For example, the same is true in many idioms. Describe "treachery" and "thinking about the past and thinking about the future" as "betrayal", "loyalty" and "thinking about the future" Such literary techniques are common in poetry, so we should pay attention to this interactive and unified relationship in poetry teaching.