First-level title: it is the chapter name of this chapter. Equivalent to the numbers in the paper: 1, 2,3 (? No.4 bold, exclusive line, no punctuation at the end. )

Subtitle: It is the name of this section in this chapter. Similar to the numbers in the paper: 1. 1,1.2,2.3. (The font size is the same as that of the text, with a single line and no punctuation at the end. )

Paper format:

? A paper generally consists of title, author, table of contents, abstract, key words, text, references and appendices, some of which (such as appendices) are dispensable.

The order of each component of the paper is as follows:

? Title, author, abstract, keywords, English title, English abstract, English keywords, text, references, appendix and thanks.