What are the functions of the first four sentences of the poem "Green Mausoleum on a Cypress"? On poetry.

In the first four sentences, tangible, colorful, audio and moving things are used as contrast and metaphor one after another, which makes the rather abstract meaning of short life very real and full of passion. The protagonist is independent and has a tendency to be pregnant: looking up, the ancient cypress on the mountain is green and does not wither in four seasons; Looking down, all the stones in the stream will last forever. The sky above, the ground below, of course, is more eternal; People born between heaven and earth, however, hurry home like travelers. (Baidu has arrived, I don't know if it's what you want)