retardation
同义词：
stupidity | prevention | crossing | prohibition | delay | check | obstruction | hindrance | impedance | obstacle | slowing | slowdown | subnormality | deceleration | lag | slowness | retardent | mental retardation | backwardness | retardant |
反义词：
词义辨析：
同义参见:
prohibition
prevention
stupidity
crossing
反义:
n.妨碍; 阻止; 减速度
acceleration