retardation

名词 retardation:

1. a decrease in rate of change
   同义词：deceleration, slowing
2. the extent to which something is delayed or held back
3. any agent that retards or delays or hinders
   同义词：retardant, retardent
4. lack of normal development of intellectual capacities
   同义词：mental retardation, backwardness, slowness, subnormality
5. the act of slowing down or falling behind
   同义词：slowdown, lag

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.
   痴愚者一个人智能迟缓发展，仅具有7岁到12岁的智能，一般在一定程度的学术或职业教育后能够进行交流和掌握社会技术。这个词是一个集合概念，现在不再使用，并被视为带有侮辱意味
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岁小孩以下，听不懂连贯话语，也不会提防普通危险的智力有严重障碍的人。这个词现在已不用来区别人的类型，现在被认为有对人不友好的意思