First, the structure is complete.

In view of the central argument at the beginning of the article, or the repetition at the end, the sentences are slightly different from beginning to end. In the process of repeatedly emphasizing the same content, highlight the main idea of the article and form the beauty of structural cycle; Or, on the basis of the original work, echo with the beginning of the article to express a deeper meaning, so as to promote readers' leap in understanding and emotion, and then highlight the theme of the article.

Second, clever questions are thought-provoking.

This way of ending is generally to ask questions, or ask questions, ask yourself and answer yourself; Or ask questions and leave thoughts, which has the advantage of reminding readers to think about the problems mentioned in the article. Doing so can not only effectively extend the length of thinking, but also expand the width of thinking.