The subject words of a document are used to express the gist of the document and summarize the characteristics of the document
its meaning must be clear and the concept used must be accurate. In our examination, we should first consider whether the selected subject words are ambiguous and whether they can summarize the purport of the document; secondly, we should consider whether the selected subject words conform to the norms of the official document Thesaurus of the State Council, and the phenomenon that we do not pay enough attention to the subject words must be corrected.
The importance of subject words