stratify词根词缀

stratify

[ˈstrætɪfaɪ]

vt.<正，术>（使）分层，成层;

过去式： stratified 过去分词： stratified 现在分词：stratifying 第三人称单数： stratifies

英文例句/中文翻译：

1、

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。

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2、

now a study of mobile phone calls has attempted to test prof dunbar's hypothesis about our russian doll-like shells of emotional intimacy, providing insight into how we stratify our social connections.

现在，一项针对手机通话的研究试图检验邓巴教授的假说——即我们的感情亲密度是像俄罗斯套娃那样分层分布的——进而帮助理解我们如何给自己的社交关系分层。

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3、

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；

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