智力落后是遍及全世界的、严重危害儿童身心健康的一类疾患,也是一个严重的社会问题。据估计,全世界约有一亿五千万智力落后患者。随着社会经济文化水平的提高,智力落后的防治工作已日益引起社会各界的重视。近三十年来,智力落后的病因学研究有了巨大进展,从而为该症的防治提供了可靠的依据。 Mental retardation is a disorder that affects the whole world and seriously endangers children’s physical and mental health. It is also a serious social problem. It is estimated that there are about 150 million illiterate patients in the world. With the improvement of social, economic and cultural level, prevention and control of mental retardation has increasingly drawn the attention of all sectors of society. In the recent three decades, there has been tremendous progress in the research on the etiology of mental retardation, which has provided a reliable basis for the prevention and treatment of this disease.