Standard deviation were all unpredicted and the absolute relative errors were less than 6.6%.

对标准差的模拟结果偏低，相对误差的绝对值小于6.6%；

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Standard deviation were all unpredicted and the absolute relative errors were less than 6.6%.

对标准差的模拟结果偏低，相对误差的绝对值小于6.6%；

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