Their smaller rival is battling to end their duopoly.

　　比他們小的競爭對手正在為結束他們兩家寡頭集團而斗爭。

　　Their price depended almost entirely on their scarcity.

　　他們的價格幾乎完全靠他們的供不應求。

　　Their friends suggested they should put up their prices.

　　他們的朋友們建議他們提高價格。