immunology

例句：

1. 1. The studyof the immune system is an important fieldin immunology.
   研究免疫系统是免疫学的一个重要领域。
2. 2. Immunology plays a crucialrole in protecting against infectious diseases.
   免疫学在预防传染病方面起着至关重要的作用。
3. 3. Researchers are exploring new ways to improve vaccines and combat diseases caused by viruses.
   研究人员正在探索新的途径来提高疫苗的效果，以对抗由病毒引起的疾病。