青春到底是什么，你问自己这个问题，却一直没有得到答案。

What is youth, you ask yourself the question, but has not been the answer.

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在调查过程中，研究人员每年会问女孩子们之前三天的饮食。研究人员会对数据进行调整，以弥补女孩在身体活动方面存在的差异以及青春期内身体的正常增加等因素产生的影响。

The data were adjusted to compensate for factors such as differences in physical activity among the girls and normal increases in body fat during adolescence.

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