It is true that global rates of infant and child mortality have been declining steadily for the past half-century and that many of the countries that achieved the goal enjoyed reasonable economic prosperity during much of the decade.
98. 过去半世纪内，全球婴儿和儿童死亡率确实稳步下降，并且实现该目标的许多国家在这十年的大部分期间都享受到相当的经济繁荣。