a substance that is put into the body of a person or animal to protect them from a disease by causing them to produce antibodies (=proteins that fight diseases)

This vaccine protects against some kinds of the bacteria. 这种疫苗能抵抗这些细菌中的某几种。

The measles vaccine is one of the immunizations that is recommended for all children. 麻疹疫苗是推荐给所有儿童的免疫接种之一。