natural acquired immunity

例句：

1. 1. The vaccine is designed toprovide natural acquired immunity against the virus.
   这种疫苗旨在提供自然获得的对病毒的免疫力。
2. 2.The children are learning about the importance ofnatural acquired immunity in preventing diseases.
   孩子们在学习关于自然获得免疫在预防疾病中的重要性。
3. 3.Researchers are studying how natural acquired immunitycan be enhanced for individuals with weakenedimmune systems.
   研究人员正在研究如何增强个体的自然获得免疫能力，以应对免疫系统较弱的人群。