A pair of phrases or sentences with equal words, the same or basically the same structural form and symmetrical meaning, expressing two opposite or similar meanings.

Function: neat and symmetrical, strong sense of rhythm, high generality, easy to remember and beautiful in music.

Main methods:

1, exactly. The dual forms of the upper and lower sentences are similar, similar, complementary and contrasting in meaning.

For example, the reeds on the wall are top-heavy and shallow; Bamboo shoots in the mountains have a thick mouth and an empty stomach.

2. Objection. The dual form of the opposite or relative meaning of the upper and lower sentences.

For example, look at a thousand fingers coldly and bow your head as a willing ox.

3. Series pair (running pair). The meaning of the upper and lower sentences has the dual forms of inheritance, progressiveness, causality, hypothesis and conditionality.

For example: only drink Changsha water and eat Wuchang fish.