青春期俗称发身期,是由儿童到成年的过渡对期,是指从第二性征出现开始至性成熟及体格发育完全的一段时期。发身前期的生长激增是在第二性征出现之前,也是性成熟的一种表现,这说明已经进入青春期。在过去一个世纪中,欧美学者观察到儿童一代比一代长高,性发育也较前 Adolescent commonly known as hair period, from childhood to adulthood transitional period, refers to the appearance from the second character until sexual maturity and physical development complete period of time. Pre-onset growth surge in the second sex before the appearance of sexual maturity is also a manifestation of that has entered adolescence. In the past century, European and American scholars have observed that children’s generation grew taller than generation one, and sexual development was also earlier