名詞 mental retardation:

1. lack of normal development of intellectual capacities
   同義詞：retardation, backwardness, slowness, subnormality

1. A person of mild mental retardation having a mental age of from7 to12 years and generally having communication and social skills enabling some degree of academic or vocational education. The term belongs to a classification system no longer in use and is now considered offensive.
   癡愚者一個(gè)人智能遲緩發(fā)展，僅具有7歲到12歲的智能，一般在一定程度的學(xué)術(shù)或職業(yè)教育后能夠進(jìn)行交流和掌握社會(huì)技術(shù)。這個(gè)詞是一個(gè)集合概念，現(xiàn)在不再使用，并被視為帶有侮辱意味
2. A person of profound mental retardation having a mental age below three years and generally being unable to learn connected speech or guard against common dangers. The term belongs to a classification system no longer in use and is now considered offensive.
   低智商者指智力水平在三歲小孩以下，聽不懂連貫話語，也不會(huì)提防普通危險(xiǎn)的智力有嚴(yán)重障礙的人。這個(gè)詞現(xiàn)在已不用來區(qū)別人的類型，現(xiàn)在被認(rèn)為有對人不友好的意思