Introduction refers to the short sentence that leads to the main title before the main title, before the main title; \x0d\\x0d\ Main title refers to the title of the article, which is used to present the center or theme of the article; \x0d\ The title of an argumentative essay directly reveals the argument, such as opposing liberalism, or reveals the content of the article, such as the three major disciplines and eight points for attention. The narrative title is implicit and symbolic, such as "How do peach blossoms bloom?" "Or people, time, place, etc. Such as the title, such as "Three Days on the Yangtze River". The titles of official documents are mostly composed of three parts: issuing unit, cause and language. Such as "Decision on Commending Heroes and Teenagers". \x0d\\x0d\ subtitle refers to the text used to explain the theme, followed by the main title, and more often it points out the time and place. \x0d\\x0d\ For example, Harbin: How far is it from the national civilized city? —— Investigation and reflection on the establishment of a national civilized city in our city. Decomposition: "An important topic facing civilized cities-"This is the Introduction. " Harbin: How far is it from the national civilized city "is a" topic "or a" main title ". -Investigation and Reflection on Building a National Civilized City in Our City is the subtitle or subtitle. The function of "subtitle" is to extend the main content of the article to the front, so that readers can appreciate the general content of the article in the shortest time.