retarded

名词 retarded:

1. people collectively who are mentally retarded
   同义词：mentally retarded

动词 retard:

1. slow the growth or development of
   同义词：check, retard, delay
2. cause to move more slowly or operate at a slower rate
   同义词：retard
3. be delayed
   同义词：retard
4. lose velocity; move more slowly
   同义词：decelerate, slow, slow down, slow up, retard

形容词 retarded:

1. relatively slow in mental or emotional or physical development

1. A substance that retards or arrests a chemical reaction.
   反催化剂延缓或阻碍化学反应的物质
2. Lack of sun retards plant growth.
   光照不足则植物生长缓慢。