Look at Lu Xun's article "In Memory of Liu Hezhen". A section can include several paragraphs. A natural paragraph is a natural paragraph in an article, that is, a paragraph with two spaces at the beginning of an article that you usually see. It is a statement in the article.
Section is a semantic generalization, usually in the second half of a natural paragraph, which is a combination of several natural paragraphs to express a relatively complete meaning. It is a paragraph statement in poetry.