Why is it said that the stars in Du Fu's poems hang down on the plains and the fields are vast, and the moon and rivers flow more than the mountains in Li Bai's poems?

The plains and fields are vast with stars hanging down, and the moon surges over the mighty river." The fields on the river bank and the rare stars in the sky interact with each other. The fields are broad because of the stars hanging down, and the stars are hanging low because of the vast fields. "The stars are hanging low because of the vastness of the fields. "Chui" means a flat river with no cover, the earth is wide and the stars are low; "Moon surge" means the moon surges with the waves, the eyes follow the waves, and the river rushes. These two sentences are outlined in large strokes, creating a majestic and vast, but yet The lonely and empty artistic conception really has the grand atmosphere of "covering the universe" (Zong Bai's Chinese language). What does such a magnificent and magnificent artistic conception have to do with the poet's affection? In fact, here, the use of magnificent and happy scenery is used to contrast the tragic feeling. The brilliant starry sky, vast fields and turbulent rivers reflect the poet's insignificance and sorrow, and even a bit of desolation and fear. Therefore, Du Fu's two famous lines about the rushing of the Yangtze River are full of melancholy in their magnificence. It is majestic and desolate. Li Bai also wrote a famous sentence about the Yangtze River in "Farewell at Jingmen", "The mountains end with the plains, and the river flows into the wilderness." Unlike Du Fu who stopped his boat to take a closer look, Li Bai took a quick glance from a flying boat, so there is a kind of freedom. Unrestrained and full of brilliance

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