A website listing some papers and materials:
1) Springer Link Foreign Language information website, downloadable PDF
https://link.springer.com/
2) Highwire Press, provided by Stanford University Highwire Publishing House, is the world's largest free journal of scientific journals and currently offers more than 1000 free full-text journals and more than 1 million free full-text articles.
https://www.highwirepress.com/
3) Conference papers at home and abroad
http://www.ourglocal.com/
4) https://arxiv.org/The latest paper, the quality of the paper need to identify themselves
5) Full-text acquisition artifact Sci-hub
http://sci-hub.io/
Usage Description: http://www.medsci.cn/article/show_article.do?id=530c6389402
https://zhuanlan.zhihu.com/p/24299207
6) Google academic
7) Accurate positioning of the academic search engine
https://www.semanticscholar.org/
8) highwire Stanford Academic Literature E-Journal
https://www.highwirepress.com/
9) Free ebook search engine
https://ebookee.org/
http://en.booksee.org/
Intute Academic Resources Search Tool
https://www.jisc.ac.uk/
One) FindArticles Literature paper Site
http://findarticles.com/
Intechopen Free Technical Literature
https://www.intechopen.com/
Lolmythesis Harvard graduate thesis sharing website
http://lolmythesis.com/
14) National Library paper Search net
http://www.ucdrs.superlib.net/
The SCI writing artifact--linggle can help learners to analyze more accurate English writing suggestions, and can infer short sentences according to their part of speech.
http://linggle.com/
16) Free online file converters
https://convertio.co/zh/
17) Determine if the journal is SCI
http://clarivate.com.cn/
Soscholar: Tianyi Academic Network
Http://soscholar.com
The website used to write a paper