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非洲对新冠疫苗的不信任延缓了预防工作
日期:2021-05-03
Words in This Story

expire – v. to no longer be usable or good after a period of time

dose – n. the amount of a medicine, drug or vitamin this is taken at one time

immunity – adj. the power to keep yourself from being affected by a disease

clot – n. (medical) a mass of dried blood that stops blood from flowing through blood vessels


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