What's the beauty of reduplication in Poems on Grass by Qingjiang River? Please analyze it briefly.

Where are you from? 1. The loop repeats 2. Strengthen musicality, have a strong sense of rhythm and fully express emotions 3. Deepen the theme and enhance the vividness and distinctiveness of poetry. As for what kind of emotion to express and what theme to deepen, it can be summarized according to ancient poems, and it can also show people or scenery more vividly.