• Humans have had no opportunity to develop a natural immunity.

    人类机会形成自然免疫力

    youdao

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

    通常都会只有天然免疫力

    youdao

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

    食用富含维他命c的食物,可增加自身免疫力

    youdao

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

    食用富含维他命c的食物,可增加自身免疫力

    youdao

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