青春期发育是人体从量变进入质变的发育时期。最近,我们对上海7～18岁城市男性青少年学生进行了一次性发育的调查,发现了性发育过程中值得注意的一些问题,这不仅对优生、优育,提高我国人种质量,指 Adolescent development is the body from quantitative change into the development of qualitative change. Recently, we conducted a one-time survey of male adolescent students aged 7 to 18 in Shanghai and found some notable problems in the process of sexual development. This not only provides us with opportunities to promote prenatal and postnatal care, improve our quality of people,