Primary literature, also known as original literature, refers to the literature created and written by the author according to the achievements in scientific research and production or related new theories, methods and ideas, such as conference papers, scientific and technological reports, periodical papers, patent documents and degree papers. This is public information.

After editing, abridgement and rearrangement, publications may be taken out of context, ambiguous and rearranged. We should read, study and quote the original text. Now many papers can be consulted online, but we shouldn't. We should go to the library to find the original documents with paper texts. Respect the achievements of others.