cream something/someone off
phrasal verb with cream verb [ T ] uk/kriːm/ us/kriːm/
提取（精华）;选取（最好的人或物）
to remove the best part of something or the best people in a group and use them for your own advantage
They had a plan to cream off the brightest kids and put them in separate schools. 他们计划挑出最聪明的孩子，把他们送进专门的学校。