Effective development policies require reliable statistical data, but the diverse and often inadequate statistical capacities of different countries make the task of developing standardized statistical indicators daunting.
161. 有效的发展政策需要可靠的统计数据，但是，各个国家的统计能力不同，而且往往不足，使制订标准化统计指标的任务非常艰巨。