博茨瓦纳或成非洲第一个全民接种疫苗的国家
日期:2021-05-02
Words in This Story
dose – n. the amount of a medicine, drug, or vitamin that is taken at one time
ascertain – v. to discover something
focus – v. to give special attention to something
burden – n. something difficult or unpleasant that you have to deal with or worry about
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