What are the expressions used by poets in the prosperous Tang Dynasty to describe the beauty of nature?

Although the poets in the prosperous Tang Dynasty have their own artistic pursuits and aesthetic tastes, the pursuit of natural beauty is their common trend. Yan Yu said in "Answering Letters": "The poems of the Great Tang Dynasty, like strict letters, are both magnificent and magnificent." The words "vigorous brushwork" and "vigorous weather" can summarize the overall style of poetry in the prosperous Tang Dynasty. "Magnificent brushwork" refers to the inner strength of poetry, which includes high-spirited, strong and clear feelings of poetry; "Vigorous weather" refers to the natural formation of poetic artistic conception, which is often praised by later generations as "the weather in the prosperous Tang Dynasty". As far as the overall artistic style of poetry in the prosperous Tang Dynasty is concerned, it is mainly to pursue beauty and vigorous beauty, thus creating a delicate and natural poetic artistic conception. Yan Yu's "Cang Shi Hua Bian" said, "In the prosperous Tang Dynasty, people were only interested, and the antelope hung on the corner, and there was no trace to be found. Therefore, its beauty is thorough and exquisite, and it cannot be parked together, such as the voice in the air, the color in the phase, the moon in the water, and the image in the mirror. " What Yan Yu has repeatedly emphasized is actually the delicate and natural artistic conception and naive and natural interest of poetry in the prosperous Tang Dynasty. It can be said that the images and styles of poems in the prosperous Tang Dynasty are all expressed in natural forms. Its strong feelings, strong momentum and strong personality are all presented with its simple and natural appearance. The sincere expression of feelings, the natural artistic conception of poetry and the simplicity and perfection of language are the concentrated expressions of poets' pursuit of natural beauty in the prosperous Tang Dynasty.