1. Enhance the meaning and enrich the expression.
2. Strengthen emotions and make them stronger.
3. Render the atmosphere to make it stronger.
4. Beautiful rhythm makes the music stronger.
5. In slow tone, reduplication is mainly used to describe scenery and express emotion. For example, the first three sentences, "Looking and searching, cold and clear, sad and miserable", vividly, euphemistically and meticulously express the author's sadness after suffering great pain.