What do the first connection and parallel connection mean respectively? What do the first couplet, the parallel couplet, the neck couplet and the tail couplet of the seven-character rhyme mean?

2. Couplets refer to the second couplet of seven-character quatrains (three or four pairs of sentences).

3. Neck couplet refers to the third triple of seven-character rhyme (five or six pairs of sentences).

4. The ending refers to the fourth part of the seven-character rhyme (seven or eight pairs of sentences).

5. Seven-character verse is a genre of China's traditional poetry, which belongs to the category of modern poetry. It originated from Shen Yue's new-style poems which paid attention to meter and antithesis during Qi Yongming's period in the Southern Dynasties. It was further developed and stereotyped by Shen Quanqi and Song in the early Tang Dynasty and matured by Du Fu in the prosperous Tang Dynasty.