2. Keyword retrieval: enter keywords in the text box on the left to get all keywords related to the input words. Find the word you are looking for and click on it to link to the corresponding chapter. To go back, click the icon at the bottom of the index list.
3. Title retrieval: Title retrieval method is to use the title, subtitle, parallel title, series title, original title, related title and pinyin of the literature to retrieve the required relevant bibliographic materials. The title allows Chinese and English to be mixed or part of the title. The key to retrieving bibliographic information by title is to know the title.
4. Abstract retrieval: It is actually a global database, similar to HowNet in China. However, EI does not enter all articles, and all entered articles represent authority and high quality.