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为了解本县城镇学生的营养状况，笔者于1993年4月对县七小的四年级、县二中的初一、高一年级共3个年级的全部学生进行了身高、体重的测量，并准确记录每个学生的出生日期。1994年4月和1995年4月我们又对上述3个年级的全部学生进行追踪调查，现将调查结果及营养评价报道如下：1?
In order to understand the nutritional status of urban students in this county, in April 1993, the author carried out height and weight measurements on all three grades of freshmen and senior students of grade four and grade two in the county. Accurately record the date of birth of each student. In April 1994 and April 1995, we conducted a follow-up survey of all the students in the above three grades. The findings and nutritional evaluation are reported as follows: