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