Those with Down's are usually moderately retarded but may also be lightly or heavily retarded. The children must be educated based on their environment and on their needs. Fourth, the U.S.
三、「唐氏症」應是「唐氏癥候群」，為各類智障的總稱，通常指中度智障，也包括輕度、重度和極重度智障，必須依照環境和需要來教育這些孩子。