1. Immunology is the study of the immune system and how it protects the body against diseases.
（免疫学是研究免疫系统以及它如何保护身体免受疾病侵害的学科。）
2. The field of immunology has made significant advancements in understanding and treating immune-related disorders.
（免疫学领域在理解和治疗免疫相关疾病方面取得了重要进展。）