Humans have had no opportunity to develop a natural immunity.
人类无机会形成自然免疫力。
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。
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。
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。
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