Categories. Types or subgroups. An everyday encounter with categories is types of food, fruits, vegetables, carbohydrates, proteins, and so on. These are food categories.

类别。类型或子群。日常遇到分类类型，水果、蔬菜、碳水合、蛋白质，等等。这类别。

You just need to survey the right subgroups of voters.

您只需要调查正确选民子群。

The Christian community is often divided into three major subgroups, and within some of those groups there are even smaller divisions.

基督教社区通常分为三大主要子群，在这子群中甚至还有更小分支。