retardation是什么意思？

retardation

例句

• Autistic intelligence varies widely, from severe retardation to savant syndrome. 自闭症患者的智力差异甚广, 从极度迟钝到学者症候群不等.
• Objective To explore the etiology of mental retardation, amenorrhea , abnormal childbearing history and abnormal sexual appearance. 目的为探讨智力低下 、 闭经 、 不良生育史和性征异常的病因.