First-class title: the title number is "I", No.4 is in bold, exclusive, and there is no punctuation at the end. Second-level title: the title number is one, which is the same as the font size of the text, and it is an exclusive line without punctuation at the end. Third-level title: the title serial number is (1), which is the same as the text size and font. Four-level title: the title serial number is (1), which is the same as the text size and font. Five-level title: the title serial number is ①, which is the same as the font size and font of the text. The title of paper No.2 is bold and centered. The subtitle of the paper is small two words, immediately below the main title, and there is a dash in front of the text.