美国的外国战斗短期几乎没有威胁

engage – v. to take part in

authorities – n. officials

jihadist – n. a Muslim who supports a campaign against non-believers

resident – n. a person who lives in a place for some length of time

whereabouts – n. the place where someone or something is

prosecution - n. the act of trying someone accused of a crime

diaspora – n. a group of people who live outside their homeland or the home of their ancestors