A quatrain is a four-line poem with five words in each line, and a heptameter is a four-line poem with seven words in each line.

The pentameter is a four-line poem with five words in each line, and the heptameter is a four-line poem with seven words in each line.

1. Pentameter

Pentameter is a poem in which each line has five words and formally constitutes complete rhyming imagery. The most common five-character stanzas are Tang poems, such as Du Fu's "Ascending to the Heights", "The wind is rushing, the sky is high, the apes are whistling, the islets are clear, the sand is white, and the birds are flying back. The boundless fallen trees are under Xiao Xiao, and the endless Yangtze River rolls on."

2. Seven-character stanzas

Seven-character stanzas are poems with seven words in each line, which once became a popular form of poetry from the late Tang Dynasty to the Song Dynasty because of its large space for expression and content, and its suitability for writing about wonders and exotic places, and for leaving words of farewell, and other subjects. One of the most famous seven-character stanzas is Su Shi's "Nian Nujiao - Recalling the Ancient Times at Red Cliff", which reads: "As the great river goes east, the waves are exhausted. On the west side of the old fortress, people say it is the Red Cliff of Zhou Lang of the Three Kingdoms." By combing the historical and cultural background, these four lines of the poem integrate people, places, history and culture into the poem, showing rich and thick imagery and expression.

3.? Appreciation

The pentameter and the heptameter are two very important forms in the Chinese poetic tradition. This form not only shows the perfection of rhyme, but also reflects the thought and beauty of Chinese culture. Besides, its features such as the beauty of its formal combination and the freshness and fluency of its language expression make it free to be innovative and unrestrained. In recent years, more and more poets have linked the tradition of this form with the future, revitalizing it with its everlasting vitality.

In short, both the pentameter and the heptameter are the essence and model of Chinese poetic culture. In terms of poetic composition, both forms have unique charms and have had far-reaching influence among future generations. Meanwhile, in today's literary world, this traditional form is also respected and cherished by many new generation poets, and a number of new works continue this beautiful tradition.

In ancient poetry, a quatrain is a four-line poem with five words per line, and a heptameter is a four-line poem with seven words per line.