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VOA慢速英语:英国启动辉瑞疫苗接种 美国证实其安全性与有效性
2020-12-09来源:和谐英语
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privileged - adj. having special rights or advantages that most do not have
specific - adj. clearly or exactly presented or stated
dose - n. the amount of medicine that is given or taken at one time
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