average life expectancy短语⁹⁶⁶⁷⁷⁺⁶ 基本例句 平均期望寿命,平均寿命预期值 家庭 Before OPEC, theaverage life expectancyof cartels had been so short that the economic analysis of cartels tended to stress the inevitability of their collapse.在石油输出国组织以前,卡特尔的平均期望寿命是如此之短,以致对卡特尔的经济分析往往是强调其解体的不可避免性。