Judging the upper and lower couplets is more important not only from the content of the couplets, but also from the flat sound at the end of the couplets. It is strictly stipulated in couplets that the last word of the first couplet should be flat and the last word of the second couplet should be flat. Later people called this rule Ping.
Extended data
Method of distinguishing up and down links
1 and the semantics of upper and lower couplets are generally inherited.
2. The ending words of the next couplet flatten the rhyme.
3. From the perspective of antithesis, the upper part is generally flat and the lower part is generally flat and flat.
4. From the analysis of cross links, cross links generally summarize the contents of the upper and lower links, with the upper link in front and the lower link in the back. If you have both wealth and happiness, the first part should focus on wealth and the second part should focus on happiness.