The immune system is considered deficient when it can no longer fulfill its role of fighting infection and disease.
当免疫系统不能抵抗感染和疾病时，即被认为免疫缺陷。
2
Even the buildings are not immune; around the country 3,200 courthouses are "physically eroded" and "functionally deficient", says the National Centre for State Courts.
甚至办公大楼都难免遭殃，全国法庭中心说，在全国有大约3200个法院受到腐蚀和功能缺陷的影响。
3
Aire deficient mice show similar immune defects with APECED patients.