Based on the meter of metrical poems (the meter of quatrains is semi-metrical poems, while the meter of metrical poems is an extension of metrical poems), the most basic meter includes the following aspects: the number of words, the number of sentences, rhyme and antithesis (quatrains do not require antithesis), and the main points are three: 1, each sentence should be parallel occasionally and the two sentences should be connected together. 3, a rhyme to the end of the flat rhyme.