词汇是学习英语的基石，考研词汇大纲来来去去，基本都是那5500个。新东方在线考研特别整理各个单词的用法、例句以及怎么读？方便同学们快速掌握！
retardation的解释
n. 智力迟钝,精神发育迟缓retardation的例句 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 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罗马不是一日建成的。单词背诵需要大家使用正确的方法以及持之以恒的努力。希望17的小伙伴们在自己的努力下，顺利的拿下5500考研词汇，为将来的进一步学习打下夯实的基础。