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中学生正处在青春发育期,是个体从童年向成年转变的过渡期,是个体成长过程中的重要转折期,对人的一生有深刻影响。研究表明:中学阶段是个体生理发育的迅猛期,其最突出的变化是性发育日趋成熟以及由此引起的第二性征的出现、性意识的觉醒。一般认为,性的成熟以女性月经初潮、男性首次遗精为标志。这样,女性约在十二三岁至十五六岁开始并达到性成熟,男性则在十三四岁到十七八岁之间。女性要比男性早熟一至二年。有关资料表明:当代青少年性发育成熟年龄明显提前。我国张景焕于1996年对山东省三个城市的六所中学的调查表明:女生初潮平均年龄为13.06
Middle school students are in their early stages of development. They are the transitional period from childhood to adulthood. They are important turning points in the process of individual growth and have a profound impact on one's life. The research shows that the middle school stage is the rapid development of individual physiological development. The most prominent change is the maturity of sexual development and the emergence of secondary sexual characteristics and awakening of sexual consciousness. Is generally believed that the sexual maturity to men's menarche, men's first spermatorrhea as a sign. In this way, women reach sexual maturity around the age of 12 to 15 and men reach the age of 13 to 17. Women are one to two years older than men. Relevant data show that: adolescent sexual maturity significantly advanced age. In 1996, Zhang Jinghuan of our country conducted a survey on six middle schools in three cities of Shandong Province. The average age of girls was 13.06