What does duality mean?

"The upper and lower words are equivalent, the structure is the same or similar, and it is full of neat and symmetrical balance beauty. This rhetorical device is called duality. " (In fact, he also regards "duality" as "duality") That is to say, duality is a figure of speech, which is from the perspective of language.

According to this definition, we can draw a conclusion that its basic point lies in "two sentences with the same number of words, the same structure and part of speech, and related meanings". It is mainly divided into three types: positive type, negative type and serial type.

Extended data

Huang Zhihao's Creation and Appreciation of Ancient Poetry (Chinese Dictionary Publishing House) pointed out: "The so-called antithesis, as the name implies, is that sentences and antitheses stand opposite each other like a guard of honor.

Parallel prose and neckline in the middle of metrical poems need to be opposed, which is one of the signs of metrical poems. ..... It requires' equal number of words, relative semantics, even words, the same part of speech and the same structure'. In other words, duality refers to a special form of expression and means used in poetry creation and couplet writing. In particular, we should avoid using the same word repeatedly in the same structural position in the upper and lower sentences.