passive-active immunity

例句：

1. 1. Thevaccine provides both passive and active immunity againstthe virus.
   这种疫苗既提供对病毒的被动免疫，也提供主动免疫。
2. 2. Theimmune system is capable of both passive andactive immunity.
   免疫系统既能提供被动免疫，也能提供主动免疫。
3. 3. The study found that thevaccine provided both passive and active immunity tothe virus.
   研究发现，这种疫苗既提供了对病毒的被动免疫，也提供了主动免疫。