The distribution of test scores in the class formed an abnormal curve, indicating a wide range of abilities.
班上考试成绩形成了一条非正态曲线，表明能力范围很广。
Educational researchers noted an abnormal curve in the participation rates of different socioeconomic groups.
教育研究人员注意到不同社会经济群体的参与率呈现非正态曲线。