指免疫系统将能与抗原发生反应的抗体作为记忆细胞保存记忆下来，当同类抗原再次侵入时，相应的记忆细胞被激活而产生大量的抗体，缩短免疫反应时间-Refers to the reaction of the immune system will be able to save the memory cells as the antibody against the antigen memorized, when the intrusion of the same antigen again, the respective memory cells are activated and produce large amounts of antibodies, the immune reaction time is shortened