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Can CNKI check the papers from a few years ago?
It's bound to be discovered. The range of comparison library for HowNet detection is as follows:

China Academic Journals Online Publishing Database

Full-text Database of Doctoral Dissertations in China/Full-text Database of Excellent Master Dissertations in China

Full-text database of important conference papers in China

Full-text database of important newspapers in China

China patent full-text database

Internet resources

English database (covering English data of journals, doctoral programs and conferences, as well as Springer and Taylor &; Francis

Periodical database, etc. )

Hong Kong, Macao and Taiwan Academic Literature Library

Priority publication literature library

Internet literature resources

Book resources

Personal comparison database

Time frame:

1900-01-01until the test day.

Therefore, the positive repetition rate of this plagiarism is extremely high. It is suggested to go to Wentianxia Paper Testing Network in advance to check.