VOA慢速英语:俄罗斯成为全球首个批准新冠疫苗的国家

immunity - n. the power to keep yourself from being affected by a disease

check - n. the process of examining something to see if there is anything wrong

grateful - adj. showing thanks

dose - n. the amount of medicine

the envy of - phrase, something that causes someone to want it

scrutinize - v. to examine carefully and critically

reckless - adj. not showing proper concern about the possible bad results of your actions

priority - n. something that is more important than other things and need to be dealt with first