目的了解中国北方健康女性青少年青春期性发育过程。
Objective To investigate the process of puberty development of healthy adolescent girls in Northern China.
关于癌症危险性的动物实验显示，这还可能是如青春期等发育阶段额外卡路里耗费的一个标志。
It could also be a marker for extra calories consumed in growth periods like adolescence, a suggested cancer risk seen in animal research.
青春期是人生历程中一个重要的时期，人的生理发育和社会性形成都在逐渐走向成熟。
Puberty is an important period in one's life, in which one's physical growth and sociality formation are approaching maturity.
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