Characteristic and Subsisting Condition of Mentally Retarded Population--Based on a Survey in Nanjing on 216 Persons of Mentally Retarded People是什麼意思_Characteristic and Subsisting Condition of Mentally Retarded Population--Based on a Survey in Nanjing on 216 Persons of Mentally Retarded People在線翻譯_英語_讀音_用法_例句