Keywords belong to a category of subject words. Subject words include not only keywords, but also narrative words of unit words and title words. Keyword is a new vocabulary of information retrieval language, which is used to describe the theme of literature and give information retrieval. It is precisely because of its appearance and development that it is possible to computerize information retrieval (computer retrieval).
Keywords refer to words or phrases that distinguish things by the characteristic relationship of concepts, express in natural language, have collocation function and accurately express the dynamic semantic conceptual relationship between words.
Keywords are keywords that mark the subject content of document construction, but have not been standardized. Keywords are words or terms selected from papers for document indexing to express the main contents and information items of the full text. A paper can choose 3~8 words as keywords.
Extended data
First, the selection method of keywords or subject words
After writing the paper, the author chooses the information or vocabulary that can express the main content of the paper. These residences or words can be found and selected from the title or content of the paper. For example, in the last example, six keywords were selected, of which the first three were selected from the topic of the paper and the last three were selected from the content of the paper.
The selection of the last three keywords supplements the main content information that the title of the paper fails to express, and also improves the conceptual depth involved. Need to choose, together with the keywords selected from the title, to form the keyword group of this paper.
The use of keywords and subject words is mainly to meet the needs of computer retrieval and international computer online retrieval. Adding "keywords" to publications has opened up a new way to improve the citation rate and increase the popularity of publications.
Second, the use of semicolons.
Semicolons are used to separate two independent concepts (two independent clauses), but these two sentences are related. When complex concepts or phrases are displayed and sentences contain commas, it is appropriate to use semicolons to separate them. Semicolon has the function of comma, but it contains more meanings, and it also has the function of colon, but it is more flexible.