Despite anything the science of medicine may have achieved, the immunesystem is our main defence against disease.
不管医疗科学已取得了什么样的进步，免疫系统仍是我们抵抗疾病的主要防御手段。
《柯林斯英汉双解大词典》
2
Stress reactions can reduce the disease fighting effectiveness of the body's immunesystem, thereby increasing susceptibility to illnesses ranging from colds to cancer.
压力反应会降低身体免疫系统对抗疾病的效力，从而增加对感冒和癌症等疾病的易感性。
3
But successful outcomes also depend greatly on the extent of the drug resistance, the severity of the disease and whether the patient's immunesystem is compromised.