Keywords are words or phrases that reflect the theme of the paper, usually arranged under the abstract, and the font size is different from the text. Generally, each article can choose 3~8 keywords, and multiple keywords are separated by semicolons, which are arranged from big to small according to the extension (conceptual scope) level of the entry.

Keywords are generally noun words or phrases, and in some cases there are verb words or phrases.

English keywords corresponding to Chinese keywords should be marked. Chinese comes first, foreign language comes last. Chinese keywords are marked with "keywords:" or "[keywords]"; English keywords are marked with "keywords:".

Key words should be selected from the National Standard Chinese Thesaurus as far as possible; Important terms and names of new disciplines, regions, people and documents that are not included in the glossary can also be used as keywords. Keywords should be general technical terms that can cover the main content of the paper.

2. Method of selecting keywords

The general selection method of keywords is: after the author finishes writing the paper, he selects from its title, hierarchical title and text (high frequency and key words).

Paper text

general idea

⑴ Introduction: Introduction, also known as preface, preface and introduction, is used at the beginning of the paper. The introduction should generally write the author's intention, explain the purpose and significance of the topic, and point out the scope of the paper writing. The introduction should be short and concise, and stick to the theme.

(2) Text of the paper: The text is the main body of the paper and should include arguments, arguments, argumentation process and conclusions. The main part includes the following contents:

A. Questions-arguments;

B. analyzing the problem-arguments and arguments;

C. problem solving-demonstrating methods and steps;

D. conclusion.

In order to achieve the purpose of clear hierarchy and clear context, the text is often divided into several large paragraphs. These paragraphs are called logical segments, and a logical segment can contain several small logical segments, and a small logical segment can contain one or several natural segments, so that the text forms several levels. The level of the paper should not be too much, generally not more than five levels.