The duplicate checking of this article depends on whether the article is included in the duplicate checking database. If documents and periodicals have been included in the duplicate checking system, they will be copied by the paper system.

In the paper duplicate checking system commonly used at present:

HowNet-mainly for colleges and universities, not for individuals.

Paper rater-mainly personal test, charging 1000 words at one yuan per word, which is now free.

Moreover, after checking and comparing, the paper duplicate checking system of paper raters is stricter than that of HowNet, and it is suggested that the paper duplicate checking system of paper raters is more secure.