ABO
noun [ S ] medical specialized uk/ˌeɪ.biːˈəʊ/ us/ˌeɪ.biːˈoʊ/
ABO血型分类法(将人类血液划分为A、B、AB和O四种类型的系统)
the system that divides human blood into four main blood groups (= types of blood), known as A, B, AB, and O
the ABO blood group system ABO血型分类系统