There has been much research show that therapeutic recreation has good benefit for mental retardation , and it is an easy way to help them to be healthy .
The effect of self-instructional strategy on learning addition for children with moderate and severe mental retardation .
自我教导策略教学对中重度智能障碍儿童数学加法学习之成效。
Down syndrome is the most common genetic cause of mental retardation , occurring in about 1 out of 700 live births .
唐氏综合症是造成智力迟钝的最普遍的基因原因,大概700个初生婴儿就有一个罹患此病。
Two of the most important causes of complications during pregnancy - foetal growth retardation and pre-eclampsia - are thought to be caused by blood clots in the arteries serving the placenta .