A monocyte is a white blood cell that can provide immunological defences against many infectious organisms.单核细胞是一种白细胞，可提供针对许多感染性生物的免疫抵抗能力。The complement system plays an important role in human immunological defences against cancer, bacteria, and viruses.补体系统在人体对癌症、细菌和病毒的免疫防御中有重要作用。Hepatitis may proceed from internal immunological disorders.肝炎可能由内部免疫紊乱引起。