慢速英语:美国医务人员自愿抗击新冠病毒

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reserve –n. a group or force that is additional to the regular force especially in the military

assigned –adj. to give a person a particular job or duty

vet –v. to investigate someone to see if they are right for a job

recruiting –v. the process of find the right people to do a job

licensed –adj. having gone through the official process to be able to do a job or offer a service

clinic –n. a place where people can get medical help for problems that are not too serious