正文

VOA慢速英语:美国确定第二批疫苗接种群体包括75岁老人以及一线员工

2020-12-22来源:和谐英语

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Words in This Story

essential – adj. very important and necessary

dose – n. the amount of a medicine or vaccine that is needed to be effective against disease

obesity – n. extremely fat

positive – adj. in a medical test, positive means the person being tested has a disease or condition