immunization
noun [ C or U ] (UK usually immunisation) uk/ˌim.jə.naɪˈzeɪ.ʃən/ us/ˌim.jə.nəˈzeɪ.ʃən/
medical specialized免疫接种
the process of protecting a person or animal from an infectious disease by putting a substance into the body that makes it produce antibodies (= proteins in the blood that fight disease)
mass/routine immunization 大规模／例行接种
Immunization gives people the ability to resist infection temporarily or permanently. 免疫接种可让人可以永久或暂时地抵抗感染。
With the use of immunizations in babies, the mortality rate has dropped significantly. 开展婴儿免疫接种以来，死亡率显著下降了。