graduate加什么前缀

graduate加前缀post，postgraduate中文意思是adj. <英>研究生的<美>博士后的，n. <英>研究生<美>博士，博士后研究人员

Discipline techniques vary by education level: 8% of those with a postgraduate degree say they often beat their children， compared with 22% of those with a high school degree or less.