homogeneous social group

例句：

1. 1.The soil is homogeneous across the entire region.
   整个地区土壤是均质的。
2. 2.The team members are all of the same age and gender, making it a homogeneous group.
   团队成员年龄和性别相同，是一个同质的群体。
3. 3.The researcher found that the samples were not homogeneous, meaning they varied in some way.
   研究者发现样本不是均质的，即它们以某种方式有所不同。