W/n is used to modify the position between the two words before and after, and the word order can be reversed. For example, foodw/5 pollution means that the gap between food and pollutants is at most 5. Patent database: the characteristics of the same patent: it has the same priority. Published by different countries or organizations. The contents of the invention are the same or basically the same.
Wn in ei retrieval formula is the abbreviation of "within", which means to limit the search term to the corresponding field. If it is used as an accurate definition in the retrieval formula, the author format must be completely consistent with the author indexing format in the paper record.