Two former ivy league presidents weighed in last year with an influential statistical study which attempted to prove that affirmative - action programmes succeeded not only in fostering diversity but also in integrating the highest levels of the professional world 去年两位长春藤大学前任校长有把握地提出一项有影响的统计调查,试图证明不仅对于促使校园中有更多少数民族,而且对消除某些职业最高层次的种族限制,倾斜政策都取得了成功。