The English in academic writing is highly conventionalized, which is quite beneficial to the non-native English speakers who wish to write up the results of their research. However, how to be able to acquire these conventions? An ESP (English for Specific Purposes) approach was introduced into the research of academic discourse by John Swales (1990). In this approach, a genre is defined as a class of communicative events, the members of which share some set of communicative purposes (Swales 1990). Research articles (RAs) have been regarded as one genre and investigated as so defined extensively using this approach. The "Writing Medical Research Papers in English: Genre Analysis & Corpus Analysis" is a good guide for Medical research paper writing.