慢速英语:美国旅行限制如何影响各个家庭

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teenager – n. someone between 13 and 19 years of age

eligible – adj. worthy of being chosen

radical – adj. extreme; very different from the traditional

shutdown – n. the suspension of an activity

master's degree – n. a recognition that is given to someone who completes a study program of one or two years after attending a college or university

uncertainty – adj. something that is unknown

toy – n. a play thing

expire – v. to come to an end; no longer legal after a period of time