单词	fifth columnist
释义	fifth columnˌfifth ˈcolumn noun [countable] a group of people who work secretly to help the enemies of the country where they live or the organization in which they work—fifth columnist noun [countable]
随便看	dud dude dude ranch dudgeon due due date duel due process duet due to duff duffel bag duffel coat duffer Dufy, Raoul dug dugout duh DUI du jour duke Duke, David dukedom Duke, Doris Duke of Cambridge

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