Seeing the weather from the clouds, the first paragraph explains what this article belongs to from a linguistic point of view.

Understand the weather by looking at the clouds, which means that there is a close relationship between the clouds and the weather, which means that you can know the weather by looking at the clouds.

Function: Paragraph 1 is an overview of a distinctive language. Always said, "The clouds in the sky are really changeable." Next, the author uses metaphor and parallelism to describe the myriad poses of the cloud very vividly, which can stimulate readers' imagination.

I hope I can help you. You can ask questions ~ ~ ~