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VOA慢速英语:非洲卫生专家警告可能爆发“疫苗战争”
2021-03-27来源:和谐英语
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significantly –adv. in a way that is important
impact –v. to have a strong and often bad effect on something or someone
absolutely –adv. completely
dose –n. the amount of a medicine or vaccine that is taken at one time
giant –adj. very large