The first couplet of the first couplet
The second couplet of the chin couplet
The third couplet of the neck couplet
The fourth couplet of the tail couplet
In quatrains (four lines to a poem, such as Li Bai's "Quiet Night Thoughts"), each punctuation mark (comma, period) is a couplet
Rhythm poem (eight lines to a poem, such as Li Bai's "Huang "Crane Tower"), each period is a couplet
It is easy to remember that the head is the top of the head, the chin is the chin, the neck is the neck, and the tail is the end