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The first cohort comprises a nationally representative sample of pupils consisting of those born on the 5th, 15th or 25th of any month in 1948. The material covers some 12 000...
第一队列由具有全国代表性的学生样本构成,样本成员均为1948年任意月份的5日、15日或25日出生者。该数据集涵盖约12000名……



