stratify
词根词缀：
prostrate v. 使俯卧；使沮丧
pro 在前 + strat 扩散；层 + e → 前〔后〕在同一个层面上 → 使俯卧
stratify v. 使分层
strati 扩散；层 + fy 使… → 使分层
stratosphere n. 同温层
strato 扩散；层 + spher 球 + e → 地球表面的一层 → 同温层
stratum n. （pl. strata ）地层；社会阶层
strat 层 + um 场所 → 人们分出层次的场所 → 社会阶层
substratal adj. 基础的
sub 下 + strat 扩散；层 + al …的，具有…性质的 → 在下面一层 → 基础的
数据来源：新东方英语词汇速记大全
相关例句：
At the same time it was analyzed how to stratify the stratums and define the optimal samples by the stratified random sampling in the study of street tree populations, and some formulas were introduced for calculating the parameters of the urban street tree populations.
其中着重分析了在城市街道绿化树种结构研究中运用分层随机抽样调查法应如何进行分层与如何确定合适的样本量；
Although the study did not stratify care recipients according to disease, the cohort did include cancer patients, who were disproportionately represented in the group of patients who died, Wolff said.
Wolff说，由于被护理者中包括癌症患者，这些病例不能合适地代表死亡病人的结构比例，因此此研究没有将被护理者按疾病进行分类。
This article mainly describes how to stratify students in science way, how to grouping them properly based on stratifications, and focuses on the practical operation and experimental research on the hierarchical and grouping teaching model.
本文主要介绍了如何对学生进行科学分层，如何以分层为依据对学生进行合理分组，并着重论述了分层分组合作教学模式的实践操作及实验研究。
We currently use a large repository of data from our operational systems to help us stratify, or classify, members.
目前，我们使用我们业务系统的一个大型数据存储库来帮助我们对会员进行分层或分类。
Results The stratify analysis showed that there were potential interaction between the occupational stress and drinking, history of hyperlipemia, family history of hypertension, age, and body mass index ( BMI);
结果叉生分析显示，职业紧张与饮酒、高血脂史、体质指数（BMI）、高血压家族史及年龄之间可能存在交互作用；
In four valve spark ignition engines, tumble motion in the cylinder is required to be intensified in order to improve combustion process in general homogeneous mixture combustion system or to stratify the air fuel mixture in lean burn combustion system.
在四气门汽油机中，运用滚流运动组织快速燃烧过程或混合气分层稀燃过程，都需要提高滚流强度。