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美国拟批准辉瑞疫苗用于青少年
日期:2021-05-05
Words in This Story

authorize – v. to give permission for something to happen

recommend – v. to suggest or propose

placebo – n. a harmless pill or medicine used as a control in testing new drugs

chills – n. a feeling of cold

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


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