1. A condition of slowness or retardation. 
   迟滞或缓慢的情况
2. The state or condition of being an idiot; profound mental retardation. 
   智力障碍处于痴呆的状态；极其严重的智力障碍
3. The state or condition of being an imbecile; moderate or severe mental retardation. 
   低能，弱智低能、弱智的状态或情况；中度或严重智力障碍
4. a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation. 
   有多一个号染色体的先天病症；病人有扁平脸和矮短体型,并且智力不足。
5. an inherited disorder of metabolism in which the urine has a odor characteristic of maple syrup; if untreated it can lead to mental retardation and death in early childhood. 
   一种遗传变态病，病人的尿液有槭树汁的气味。

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• 1. 减速度
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• 2. 减速
  retaining wall (earth) 护土墙；挡土墙...retardation 减速...retarder 缓凝剂；减速剂
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• 3. 延迟
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• 4. 阻滞
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