The preface and postscript of the joke are urgent! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !

Foreword: Also known as preface, preface, narration, thread, quotation and ballad. Text written in front of a book or article. The preface of the book, published before the text, mainly explains the basic content, editing (translation) intention, writing process, academic value and translator's introduction. Written by translators, editors or others. The preface in an article is usually used to explain the main idea or purpose of the article. It can also be understood as the essence of what is written.

Postscript: words written at the end of a book or an article. Often used to explain the writing process, or evaluate the content, etc. Also known as postscript or postscript. After writing an article, if you want to have any supplementary or missing questions, you can use the form of postscript. Some interviews or news articles, which have new developments since then, are inconvenient to be introduced separately, and can be supplemented in the form of postscript. It can not only enrich the content of the article but also delay the publication, killing two birds with one stone. Sometimes the author deliberately puts forward a thought-provoking point of view on a problem in the form of postscript, which makes readers think deeply. If you have an inscription, you don't have to have an postscript. The postscript is just the sublimation of the center of your article. You can use a natural paragraph at the end to express the center, not necessarily a postscript. Sometimes it seems that the article is too complicated to use postscript.