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adj. �����ٶ۵ģ���չ�ٻ���

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n. mentally retarded

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a.   precocious

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1. He is completely retarded.
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2. Small molecules are retarded from leaving the column.
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3. The dog receives special privileges.
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n.
  1. people collectively who are mentally retarded
  2. relatively slow in mental or emotional or physical development

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retarded
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Gas retarded
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retarded cement
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retarded ignition
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retarded combustion
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