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1·Humans have had no opportunity to develop a natural immunity.

人类无机会形成自然免疫力。

2·Boost your natural immunity with foods that are rich in Vitamin c.

的食用富含维他命c的食物，可增加自身免疫力。

3·There's usually one pup in a litter that has a sort of natural immunity.

通常一窝狗中都会有一只有天然的免疫力。

4·Scientists believe that natural immunity to allow these patients escaped HIV attacks.

科学家认为，是天然免疫力让这些病人躲过了HIV的攻击。

5·Swine flu is a mix of pig, bird and human genes to which people have limited natural immunity.

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。

6·The locals seem to have a natural immunity to Kaoliang and love to share Kaoliang with visitors.

当地人看来部近对高粱有天生的免疫力，也喜与游客一同分享。

7·Some people seem to have natural immunity of AIDS, they are always in the HIV high-risk environment, yet will not be infected.

有些人似乎对艾滋病具有天生的免疫力，他们经常处于艾滋高危环境中，却从不会被感染。

8·When new influenza viruses are introduced into the environment, humans do not have any natural immunity to protect against them.

当新型流感病毒进入到环境中以后，人类对它们没有任何自然抵抗力。

9·As people would have no natural immunity, a new influenza virus could cause widespread death, illness, social and economic disruption.

由于人无天然的免疫力，一种新的流感病毒可引起广泛的死亡、疾病、社会和经济破坏。

10·Our position is if you feed your dog a healthy all-natural diet his natural immunity will handle almost anything that he runs into.

我们的观点是，如果用健康的纯天然食物喂养狗儿，那么它们自身的免疫力将可以应付任何情况。