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VOA慢速英语:辉瑞称其新冠疫苗有效性超过90%
2020-11-10来源:和谐英语
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initial - adj. happening at the beginning
significant - adj. very important
global - adj. involving the entire world
impact - n. a powerful or major influence or effect
dose - n. the amount of medicine that is taken at one time
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