The question above... is too simple and does not answer the point.
Answer: Because these two poems are rich in imagination and appropriate metaphors, they compare the mountains and rivers to green snails. The colors are light and elegant, and the silver plate and the green snails set off each other and complement each other.
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The poet's sight focused from the vast Pinghu to Junshan. Under the bright moonlight, the Dongting Mountain becomes more verdant, the Dongting water becomes clearer, and the mountains and rivers are integrated into one. It looks like a small and exquisite green snail placed in a carved silver plate, which is very endearing. . The three or four lines of the poem are rich in imagination, appropriate metaphors, and elegant in color. The silver plate and the green snail set off each other and complement each other. The Dongting landscape in the autumn moon described by the poet has become an exquisite art and craft treasure, giving people great artistic enjoyment. "A green snail on a silver plate" is such an incredible phrase. However, its excellence is not only reflected in the elegance of the design, but also in the magnificent and extraordinary magnanimity it expresses and the noble and noble sentiments it entrusts. In the eyes of the poet, the Dongting of thousands of miles away is nothing more than a mirror in the dressing room and cups and plates on the table. It is very rare to lift a heavy weight and feel it is light, to sit together naturally and without any pretentiousness. To express the relationship between man and nature in such a cordial manner and to describe the scenery of lakes and mountains in such a vast and pure way is a reflection of the author's character, sentiment and aesthetic taste. It is difficult to write without the courage to think deeply and absorb the essence of mustard seeds, and without the embrace of a thousand-year-old clothes and nirvana. It is rare for a landscape poem to reveal the poet's romantic whimsy.