一、主要特征 1.成长发育上出现了加速现象 科学家发现,在近一二百年来的人类社会尤其是发达地区或国家中,青少年的成长发育呈现出日益加快的趋向,这种所谓的“发育加速现象”包括相互联系的两个方面,一是成长加速现象,指身体形态包括身高、体重、胸围等方面的成长速度比以往加快;二是成熟提前现象,指女子月经初潮和男子首次遗精的年龄等成熟指标越来越趋于低龄化。依此来看,我 First, the main features 1. Accelerated growth and development appeared Scientists found that in the past one or two centuries of human society, especially in developed regions or countries, the growth and development of adolescents showed an accelerating trend, this so-called “ Accelerated development ”includes two aspects of mutual relations, one is accelerated growth, refers to the body shape, including height, weight, bust and other aspects of the growth rate faster than in the past; the second is the mature early phenomenon refers to the women’s menarche and first spermatorrhea Mature age and other indicators more and more tend to younger age. From this point of view, I