What do you mean by couplet crossword?

Couplet cross-checks for studiousness and diligence, top line: read the sacred books;

Couplets, as one of the traditional cultures of the Han Chinese people, and at the same time, also known as couplets or pairs of couplets, are pairs of phrases written on paper or cloth or carved on bamboo, wood, or pillars. Couplet is a unique art form of the Chinese language with neatly written couplets and harmonized levels and tones. Couplets are a treasure of traditional Chinese culture.

Extended information:

Couplet couplets, door pairs, spring stickers, spring couplets, pairs of couplets, peach charms, pillars and couplings (named for the pillars that were mostly hung on the pillars of the buildings in the halls of houses in the ancient times), etc., are a kind of Couplet literature, originated from peach charms. It is a pair of statements written on paper or cloth or carved on bamboo, wood or pillars. Simple words with deep meaning, neat pairs of words, coordinated pairs of words, the same number of words and the same structure, it is a unique art form of the Chinese language.

Couplets are the treasures of traditional Chinese culture, and the earliest recorded couplets appeared in the Three Kingdoms era. Ming Hongwu years, in Jiangxi Luling place, unearthed a large iron cross, cast on the Three Kingdoms era Sun Quan Chi Wu years.

In the iron cross and cast a beautifully artistic couplet cloud: "the four seas to celebrate the peace and prosperity, the iron pillar of precious light to stay in the cross; the ten thousand people to welcome the great Zephyr, the golden furnace incense seal affinity thousand years." The couplets hung during the Spring Festival are called spring couplets, those for funerals are called elegiac couplets, and those for joyous occasions are called celebratory couplets. Couplets are a national literary style written in Chinese characters, and generally do not need to rhyme (only the couplets in poems need to rhyme)