Search English papers can be searched from databases or documents. If it is a database, it can be retrieved from VIP database, Wanfang database and China HowNet database in China, or from Superstar Library, Scholar's Home Library, China Digital Library and SpringerLink, IEEE/IEE, ProQuest, EngineeringVillage, EBSCO, SCIENCEDIRECT and OCLC databases abroad. If you search from the literature, the full text of domestic periodicals and newspapers can be searched in Wanfang, Weipu and China HowNet, and other professional databases can also be searched; Dissertations can be searched in Wanfang and China HowNet. Patents, standards and other documents still need to be searched in the corresponding database. Foreign periodicals can be searched in the database I provided above, and most dissertations are searched in ProQuest database.