In the rhetoric of English literature, there is a difference between duality and contrast. Explain alliteration in English rhetoric.

1, duality is antithesis, antithesis and duality in rhetoric (usually two juxtaposed words, phrases or sentences, such as: You are going；; I want to stay. ) 2. Contrast is a contrastive technique in rhetoric. 3. Alliteration is alliteration: alliteration is an ancient rhetorical device, which first appeared in English poetry. Refers to a group of words, repeated words with the same initials in a sentence or a line of poems, such as vice and virtue, twists and turns, Enron, tit for tat and so on. Most alliterations are consonants. However, it should be noted that letters that do not pronounce the original sound do not constitute alliteration. Phrases such as physical pain and psychological strength cannot form alliteration in phrases because the letter P in the combination of ph and ps is silent. Another example is: many people in the west are gourmets, others are gluttons, ... makes you a saint or a sinner? In the above two examples, the initials of gourmets and gourmets are both G, and the initials of saints and sinners are S, which constitutes an alliteration. The alliteration takes advantage of the * * * feature of the pronunciation of the first letter of a word, which plays a unique rhetorical role, makes the language more vivid, appropriate and appealing, and achieves a beautiful and pleasing effect. The rhetorical functions of alliteration are: enhancing the sense of rhythm of language. Make the form have the beauty of symmetry and read harmoniously. 4. Metaphor is metaphor, metaphor is metaphor, and one thing is another. Metaphor is the psychological behavior, linguistic behavior and cultural behavior of perceiving, experiencing, imagining, understanding and talking about such things under the hint of such things. Poetry, especially modern poetry, has important characteristics in the collocation of words, and likes to break through the established relationship between words and connect some seemingly unrelated things together. Combining seemingly unrelated words together, new critics generally call it metaphor. He is a pig. He is a pig. (Metaphor: He is a pig, which means dirty and gluttonous. She is a woman with a heart of stone. She is a woman with a heart of stone. (Metaphor: This woman is ruthless. Mark Twain is a mirror of America. Mark Twain is a mirror of America. It is easy to compare the reality of America with a mirror. Allusion is a metaphor, a classification of metaphor, which illustrates another thing through one thing. These two things may be far apart, but because we are familiar with the former, we can quickly understand the latter because of their similarity. Since metaphor is also a symbol, it can naturally arouse people's emotions, even more effectively and quickly than commonly used words. I hope it helps you.