慢速英语:美国因担心新冠病毒而驱逐数千名寻求庇护者到墨西哥

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expel– v. to remove someone from a school, club or country

pandemic– n. an illness that spreads to other countries

challenge– v. to question the authority of someone or something

vulnerable– adj. able to be hurt

consul – n. an official who works with visas