If you consult the literature in the early stage of a paper, sometimes you can't know clearly whether the paper is what you want just by looking at the title of the paper, but you can judge it by reading the abstract carefully.
This is why every paper abstract is necessary-it can help you quickly screen out the documents you need, and its accuracy is far better than topic screening.
At the same time, for today's paper retrieval database, paper abstracts can contribute to computerized full-text retrieval. A paper retrieval system like HowNet can search abstracts, and the precision and recall are much better than the search topics.
According to the general requirements of APA format (American Psychological Association, American Psychological Association) for papers, an English abstract of 150 words should not only include the research significance, research purpose, research methods, research contributions and keywords you choose, so why browse the whole article when consulting the literature? Read the abstract and you will know everything.