(4) www.kingbook.com.cn/y.htm. Jintu International Foreign Language Original Digital Library.
(5) ki.net HowNet, China
(6) Wan Fang data/
(7)EBSCOhost database/
(9) Reading display of academic search
Title, author, abstract, keywords, author unit, literature source, degree awarding unit, degree level, conference information, conference place, duration, title, publication place, publication year, patent number, report number, ISBN, ISSN, etc. It depends on what literature you want to look up. Different types of literature retrieval have different fields, so there is no such problem.
Hope to help the landlord!