In poetry, the neck couplet is the third link and the third sentence of metrical poetry. It requires neat antithesis, concise language, beautiful artistic conception, clever transformation of upper and lower sentences, coherent momentum and profound content.
Specifically, the neck joint needs to be consistent with the first joint and parallel joint in structure and rhythm in order to form a complete whole. At the same time, the necklace needs to echo and deepen with the first two couplets in content and artistic conception, showing deeper thoughts and emotions.