stratify/ˈstrætɪfaɪ; `strætəˌfaɪ/ v(pt, pp -fied) [Tn usu passive 通常用於被动语态]arrange (sth) in strata or grades, etc 使（某事物）分层或分等级等: stratified rock 成层岩 a highly stratified society, ie having many different levels 有很多阶层的社会.
牛津英汉双解词典