[] ( duopolies) () a situation in which an industry is controlled by two companies; the two companies themselves（对某一行业的）双头垄断，两强垄断◆The two companies have a duopoly in the heavy aircraft market.这两家公司对重型飞机市场实行了双头垄断。◆The business is one half of a duopoly.这家企业是两强垄断中的一强。➡monopoly