Et.a is the Latin abbreviation of "etalii" or "eta lie", which means "others". In academic papers, journal articles, books and other documents, the citation mode of et.a often appears, indicating that the contents in this document are contributed by others or other researchers. For example, in academic papers, the author will quote the research results of other scholars, but not all researchers need to list them. At this time, et.a can be used to express the contribution of others.