可数名词：
1. 家，家庭
2. 家庭成员及关系密切的亲戚
3. 家族，家世；世系
4.（动植物的）科；具有相同特徵和同一来源的一组事物（如语言）
[C,U]
子女 词形变化
- 复数 families
- a person having kinship with another or others
- (biology) a taxonomic group containing one or more genera
- an association of people who share common beliefs or activities
- a collection of things sharing a common attribute
- a loose affiliation of gangsters in charge of organized criminal activities
- a social unit living together
- primary social group; parents and children
- people descended from a common ancestor