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VOA慢速英语:口服疫苗引起更多的脊髓灰质炎病例
2019-11-28来源:和谐英语
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oral – adj. of or relating to the mouth
paralyze – v. to make a person or animal unable to move or feel all of part of the body
eradicate – v. to eliminate or destroy something harmful
dose – n. the amount of a medicine, drug, or vitamin that is taken at one time
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