The next sentence of "beautiful mountains and beautiful waters are more beautiful" is "new land, new sky and new scenery" This is a couplet, which requires part-of-speech antithesis, with the ground facing the mountains, the sky facing the water, and the people facing the scenery. Both the upper and lower couplets use parallelism and progressive grammar to describe the human landscape. Couplets 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. Couplets are the treasures of China traditional culture, and the earliest recorded couplets appeared in the Three Kingdoms period.