How to understand Ai Qing's artistic pursuit of "poetic prose beauty"?

Ai Qing's poems are all free poems. His free style abandons the prose culture of early free poetry and pursues the prose beauty of "freedom becomes constraint" It is manifested in two aspects: first, it emphasizes the prose beauty of poetic language. Pay attention to extracting rich, vivid and changing languages from life. In his mature works, his language is more simple, cordial, fresh, clean, concise and expressive. Secondly, he pays attention to the internal rhythm of poetry, melts the external rhythm into the internal skeleton of poetry, and accumulates the form in the content. No matter how long or short his poems are, they are all chapters with no fixed stanzas, no fixed stanzas, no restrictions on rhymes and numbers, but they have internal melodies and rhythms. For example, "Dayan River-My Nanny" has thirteen verses, sixteen long verses and only four short verses. The number of words per line ranges from 22 words to at least two words. The whole poem does not rhyme, but the first and last sentences of each section are repeated to determine the tone of emotional expression. The lines in the middle are mostly compound sentence, mostly long sentences, which make the emotional expression form a natural rhythm and melody. Maintain harmony in differences and unity in changes. Free verse is flexible and mature in Ai Qing's hands.