Dual balance: Couplets are composed of two sentences, and the number of words and rhythm of each sentence are the same or similar, forming a dual balance structure.
Meaning correlation: The two sentences in couplets are related in meaning, usually in the form of mutual echo, symmetrical reflection or symmetrical inversion.
Beautiful writing: The writing of couplets requires proper wording and easy memorization, which can not only convey profound thoughts, but also show the beauty of China's calligraphy.
Content extraction: The content in couplets should be as concise as possible, and the expression should be clear and impressive, which is an important part of folk literature.
In a word, couplets are a kind of literary form with rich cultural connotation and artistic value. They express emotions, shape images and convey the wisdom and thoughts of the Chinese nation through language and artistic means.