Explanation:
A quatrain is a kind of modern poetry: it consists of four sentences, five of which are called quatrains and seven are called quatrains.
Rhyme is one of China's modern poems, which has strict metrical rules and consists of eight sentences, seven of which are called seven-character metrical poems.
Seven-character style is a special style, which was first created by Cao Pi, a native of Wei Wendi. It is a poetic genre that can be sung with music. The number of general sentences is uncertain, and the number of words in each sentence is fixed. The words "Song" and "Xing" are very common in poetry titles.
Seven-character ancient poetry is the most vivid form, the most diverse genre, the most free syntax and phonological treatment, and the most expressive lyric narrative in ancient poetry. Simply put, it is long in length, large in capacity and flexible in rhyme. For example, Du Fu's seven-character ancient poem "Song of Lady Gong Sun's Female Student Dancing Knife" and "Song of General Cao's Drawing" and so on.