1. In China's poems, "piece by piece, piece by piece" and "piece by piece is ABAB" are common poetic forms. The characteristic of these forms is that the rhyme of each sentence is fixed. Among them, paragraph by paragraph, A times A, is usually called "antithetical sentence", and paragraph by paragraph, ABAB, is called "rhyming sentence".
2. Phrases are linguistic units that can be collocated in syntax, semantics and pragmatics. They are also called phrases. They are grammatical units that are larger than words but do not form sentences.