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慢速英语:快速传播的新冠病毒变种引起关注

Source: 恒星英语学习网    2021-01-28   English BBS   Favorite  
Words in This Story

variant –n. something that is different in some small ways from others of the same kind

booster –n. an additional amount of medicine or vaccine that increases resistance to disease

monitor –v. to watch or observe carefully over time for a special purpose


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