1. 名詞
   不可數名詞: 遲緩, 遲鈍
   遲延, 推遲
   遲滯
   阻礙, 妨礙物
   妨礙量
   減速度
   不可數名詞:
   mental retardation:
   智力缺陷
   智力遲鈍
   

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   同義字詞
   braking,deceleration,letup,slowdown
   

例句

1. Mental Retardation , 34(4), pp231–242.
2. Emotion specificity in mental retardation .
3. He seems to have slight mental retardation .
4. Children experience growth retardation and short stature.
5. Most have mental retardation in the mild to moderate range.
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