Of course, the precise return on investment in expanded preschool education is difficult to discern. But, in order to prioritize development targets – within and outside of the realm of education – estimates must be made.
当然，投资于扩张学前教育的准确回报很难估量。但是，为了给发展目标（不管是否属于教育领域）排出优先级别，我们必须做一个评估。