What are the wonderful antitheses in ancient poetry?

The form and origin of duality is to express two corresponding or similar figures of speech with a pair of phrases or sentences with the same number of words, the same structure and symmetrical meaning. It is very common in ancient poetry, and couplets in modern poetry are generally antithetical sentences.

Because Chinese is prone to duality, it is often used to trace back to the classics of Zhou and Qin Dynasties, catch up with modern ballads and even make jokes. This form has always been loved by the people. The development of dual form from accidental production to conscious mass creation is the result of gradually paying attention to temperament since Wei and Jin Dynasties.

The classic antithesis sentence meets the rain after a long drought, and meets an old friend in another country. -Song Wang Zhu's "Poetry of a Prodigy"

I don't know if I have black hair and study hard early, but I regret learning late —— Don Yan Zhenqing's Poem of Encouraging Learning.

Mermaids shed pearl-like tears on the moon-green sea, and the blue fields breathed their jade to the sun. -Don Li Shangyin's "Jinse"

Flowers still bloom every year, but they are different from year to year. -Don Liu Xiyi's "A Generation of Sad Pulsatilla" recognizes that the past cannot be remonstrated, and those who know it can be pursued. -Tao Yuanming's Ci of Returning to Xi in the Eastern Jin Dynasty