Keywords don't need to be blank, and keywords rank high. The word "abstract" is centered in the abstract, and the first line of each paragraph is indented by two words. According to the different requirements of the thesis template of your school, the requirements of each school will be different. Expanding the content of data abstract requires a brief description of the purpose, research method and final conclusion of the research work, with emphasis on the conclusion. It is an independent and complete paper, which can be cited and popularized. Require brevity, accuracy and completeness. The number of words can be as few as dozens, and it is advisable not to exceed 300 words.

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 words and keywords). Usually arranged at the bottom of the abstract, the font size is different from the body. 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.