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 disease-free 添加此单词到默认生词本
无病的




    1. And chickens may be grown in closed, disease-free environments.
    2. And each of the four babies that remained disease-free was born to a mother whose prenatal blood tests showed a high level of the PND antibody.
    3. The vets raise their own hamsters and isolate captured prairie dogs before feeding them to the ferrets to ensure a disease-free meal.
    4. Crisis or not, the commission is pressing ahead with a 10-year plan to protect endangered habitats and restock them with disease-free gazelle, ostrich and native birds.
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