The significance of seven-character couplets and eight-character couplets

The difference between seven-character couplets and eight-character couplets lies in the number of words. According to relevant data, the meaning of couplets is: couplets, also known as couplets, door pairs, spring stickers, spring couplets, couplets and so on. Are antithetical sentences written on paper, cloth or engraved on bamboo, wood and columns? The antithesis of couplets is neat and even, which is a unique artistic form of Chinese.