Articles: Papers, general research papers. Short (short) communication: short essays, with fewer words, generally less than 2000 words, are similar in format to essays, but some magazines require short essays without subtitles (such as introduction, methods, results, etc.). ).

Letters: Generally, they can be divided into review letters and research letters. The former is a review of papers published by magazines in the past, generally within 500 words; The latter is a research paper shorter than short communication, generally less than 600 words, and a few can be relaxed to 1000 words.

However, the research letter in the journal Nature is different from what we usually say, and it is still an article in essence.