N a system for classifying human blood on the basis of the presence or absence of two antigens on the red cell membrane: there are four such blood types (A, B, AB, and O) (人类的)血型系统
Abo system: a classification system for human blood that identifies four major blood types based on the presence or absence of two antigens a and bon red blood cells.
abo血型分类法：一种人类血型分类方法，以红细胞上有无a和b两种抗原而分为四种血型。
As last year, the day will be celebrated on 14 June, the birth date of Karl Landsteiner, who discovered the ABO blood group system.
如同去年一样，这一天将于发现ABO血型系统的Karl Landsteiner的出生日期6月14日进行庆祝。
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