What do you mean by "right", "opposition" and "flow"?

Duality, also known as duality (in ancient times, defending nobles with weapons was about a pair, which later became etiquette), refers to a sentence or phrase in which two words are equal or roughly equal, the structure is the same or similar, and the related meanings are symmetrically arranged together. Duality can make the meaning of expression more full and clear; Make the melody appear cadence, clear rhythm and harmonious. Structurally, duality can be divided into strict pair and wide pair. Strict requirements, the upper and lower sentences are required to have the same number of words, the same structure, the same part of speech, flat and parallel, and cannot be used repeatedly. Such as "However, when China keeps our friendship, heaven is still our neighbor" and "Leaves fall like the waves of a waterfall, and I watch the long river always roll forward". The former is the fifth and sixth sentence in the five-character poem, while the latter is the fifth and sixth sentence in the seven-character poem. The second couplet (three or four sentences) and the third couplet (five or six sentences) in metrical poems must be antithetical sentences. These two cases fully meet the strict requirements, with neat form, harmonious rhythm, cadence and catchiness. In China's classical poems, metrical poems pay attention to the parallelism and antithesis of words, so they are often strictly opposed. Tolerance is not so strict. Forgiveness is not used in formal poetry, but in prose and parallel prose. Judging from the relationship between the upper and lower sentences in meaning, there are basically three kinds of duality: positive, negative and string. On the contrary, the meanings of the upper and lower sentences are the same, similar or complementary. For example, "two orioles sing green willows, and a row of egrets go up to the sky." The window contains a thousand pieces of autumn snow in Xiling, and the Wu Dong Wan Li boat is moored at the door. The two antitheses have complementary meanings and depict the view of the thatched cottage from the inside out. Objection, the meaning of the upper and lower sentences is opposite or relative. For example, "Mei Xu Xun's snow is white, and the snow will lose a piece of Mei Xiang". In string pairs (stream pairs), the meanings of the upper and lower sentences are related (there are relationships such as inheritance, progression, causality, hypothesis, conditions, etc.). ), such as "But you can broaden your horizons for 300 miles by walking up a flight of stairs" and "Come back from this mountain, pass another mountain, go up from the south, and then go north-to my own town! ".The former is a hypothetical connection, and the latter is an inheritance.