Cross-examination of couplets refers to putting a banner (cross-linking, cross-linking) on top of a couplet.
Generally speaking, it is used for some necessary couplets. The so-called "horizontal" refers to the writing method of horizontal writing; "Approval" means revealing and commenting, which means supplementing, summarizing and perfecting the theme of the All-China Federation.
The ancients posted the word "Yichun" more and more at the beginning of spring, and later it gradually developed into Spring Festival couplets, expressing the good wishes of the working people in China to ward off evil spirits and avoid disasters, and to welcome the good fortune. Couplets are antithetical sentences written on paper, cloth or engraved on bamboo, wood and columns. It is a unique art form of Chinese, concise and profound, neat and even, with the same number of words and the same structure.
Parallel prose and rhyme are two direct sources of couplets. In the process of its own development, couplets have absorbed the characteristics of ancient poems, essays, lyrics and songs. Therefore, the sentence patterns used in couplets include ancient poems, prose sentences and parody sentences in addition to regular poems and parallel prose sentences.