Rhyme, also known as rhyme, refers to the requirement that the vowels of words at the end of certain sentences are the same or similar in poetry creation. When reading or singing, it produces a loud sense of harmony. Since ancient times, the man's phonological system has also changed, so there are two phonological systems, ancient and modern. So there are two kinds of rhymes in poetry: one is rhyming according to ancient sounds, and the other is rhyming according to Chinese. There are some detailed requirements for rhyming, that is, the eight precepts of rhyming mentioned by the ancients: one abstinence from rhyme, two abstinence from rhyme, three abstinence from rhyme, inverted rhyme under temptation, five abstinence from dumb rhyme, six abstinence from strange rhyme, seven abstinence from squeezing rhyme and eight abstinence from rhyme.
Yes, it's a form of expression of medieval poetry. The strict duality in poetry is called duality. The antithesis mainly includes the antithesis of words and the antithesis of sentences, and the antithesis is mostly used in parallel prose. Dueling is also called team warfare and platoon warfare. It puts words with similar or opposite concepts in corresponding positions, so that they set off each other, make sentences more attractive and increase the expressive force of words. In a word, the duality of poetry can be summarized as three elements: the same structure, the opposite part of speech and the opposite level.