科学家认为，是天然免疫力让这些病人躲过了HIV的攻击。
Scientists believe that natural immunity to allow these patients escaped HIV attacks.
天天利用益生菌为你的孩子供给有益肠道细菌来撑持孩子的天然免疫力。
Taking Culturelle on a daily basis helps populate your child's intestinal tract with good bacteria to help support your kids' natural defenses. Culturelle?
新的猪流感病毒是以往猪，禽和人流感病毒的混合体，人们对其缺乏天然免疫力。
Swine flu is a mix of pig, bird and human genes to which people have limited natural immunity.
但很难说清因感染获得了何种程度的天然免疫力，尤其是因为在绝大多数患者身上，疾病的性质非常温和。
But knowing how much natural immunity has been acquired through infection is more difficult, especially given the very mild nature of illness in the vast majority of patients.
但很难说清因感染获得了何种程度的天然免疫力，尤其是因为在绝大多数患者身上，疾病的性质非常温和。
But knowing how much natural immunity has been acquired through infection is more difficult, especially given the very mild nature of illness in the vast majority of patients.
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