十几岁的中学生，正面临人生一个极为重要、极为复杂的时期。这种重要性和复杂性，可以从多门学科所得出的不同结论得以反映。比如：生理学研究者认为，十几岁正处于青春发育期；心理学研究者认为，十几岁正处于心理转变期；法学研究者认为，十几岁正处于违法犯罪的危险期；教 Teenage middle school students are facing an extremely important and extremely complicated period of life. This importance and complexity can be reflected in the different conclusions drawn from many disciplines. For example: Physiological researchers believe that teens are in adolescence; psychology researchers believe that teens are in a period of psychological change; legal researchers believe that teens are in a dangerous period of crimes;