stratify[ˈstrætifai]

v.（使）成层
‖ stratified random sampling分层随机抽样
stratified sample分层样本
stratified sampling分层抽样
stratified structure层状结构
stratified systematic sampling分层系统抽样
stratifying factor分层因素
stratification n.阶层化，分层，成层作用
stratification grammar成层文法