是防御疾病的第一道防线。
这是在冬天时能成功防御疾病的有效健康产品，我每天接触很多人，但是从来没有生病过。
This has been very successful in preventing illness this winter. Working in a health care field, I contact may people each day, and have not been ill yet.
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。
Despite anything the science of medicine may have achieved, the immune system is our main defence against disease.
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