Characteristic and Subsisting Condition of Mentally Retarded Population--Based on a Survey in Nanjing on 216 Persons of Mentally Retarded People是什么意思_Characteristic and Subsisting Condition of Mentally Retarded Population--Based on a Survey in Nanjing on 216 Persons of Mentally Retarded People在线翻译_英语_读音_用法_例句