two-group theory

例句：

1. 1. The two-group theory suggests that the effects of educationare not uniform across all students.
   二组理论认为教育效果并非对所有学生都是统一的。
2. 2.This research is based on the two-group theory, which posits that differentgroups of people have distinct characteristics.
   这项研究基于二组理论，该理论认为不同的人群具有不同的特征。
3. 3. In thisstudy, we applied thetwo-group theory to analyzethe relationship between social class and healthoutcomes.
   在这项研究中，我们应用了二组理论来分析社会阶层与健康结果之间的关系。