The intelligence quotient(IQ ) of each groups dropped step by step with the rise in age, especially for those above 90 years old.
各年龄组智商呈阶梯式降低，90岁以后降低尤其明显。
The intelligence quotient(IQ ) of each groups dropped step by step with the rise in age, especially for those above 90 years old.
各年龄组智商呈阶梯式降低，90岁以后降低尤其明显。
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