Metaphor: used for narration, explanation and description, it can make things vivid, vivid and concrete, and give people a vivid impression; When it is used in argumentative writing, it can concretize abstract truth and make abstruse truth easy to understand.

Analogy: it can make readers have a vivid impression on the things expressed, produce strong feelings and cause * * *.

Metonymy: it can highlight the image and make it concrete and vivid.

Exaggeration: it can arouse rich imagination, better highlight the characteristics of things, and cause a strong buzz among readers.

Duality: formally, syllables are neat and symmetrical, with strong sense of rhythm and beautiful rhythm; The content is concise and concentrated, with strong generality.

Parallelism: it can enhance the momentum of language. Accustomed to reasoning, can explain the truth more closely and thoroughly; Used to express feelings, can express feelings to the fullest.

Question: The overall function is to make readers think. Used in the title, it can attract readers, inspire readers to think and better reflect the center of the article; Used at the beginning or end of a paragraph, it can not only arouse thinking, but also play a transitional role in connecting the preceding with the following; When used in argumentative writing, the argument can be deepened and the context is clear.