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VOA慢速英语:联合国警告新冠疫情期间儿童疫苗接种量惊人下降
2020-07-29来源:和谐英语
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alarming – adj. something that is worrisome or dangerous
routine – adj. a common or usual activity
immunity – n. to be vaccinated against a disease
pandemic – n. a contagious disease that moves from one country to another
immunize – v. to vaccinate someone against a disease
challenge - n. something that is difficult to do