duopoly

詳細解釋：

du.op.o.ly

n.（名詞）
An economic or political condition in which power is concentrated in two persons or groups.
兩強霸權；雙頭壟斷：權力集中於兩人或兩個集團的經濟或政治狀況

來源：
duo-
duo-
(mono)poly
(mono)poly