变声期是指一个人在成长发育过程中的一种生理现象。整个过程可分为三个阶段:变声初期,变声中期和变声后期。变声初期:这一阶段,学生的发声器官比较纤细,柔嫩和脆弱。主要表现为:发音持续性差、易疲劳、声音不稳定、歌唱时感觉很费力;变声中期:发音器官的变化比较明显,特别是声 Variable voice is a person in the process of growth and development of a physiological phenomenon. The whole process can be divided into three stages: the early change of voice, the middle of voice change and the later change of voice. Initial change: At this stage, the students’ vocal organs are slim, tender and fragile. Mainly as follows: persistent poor pronunciation, fatigue, unstable sound, feeling very hard when singing; variable sound mid-term: pronounced organ changes more obvious, especially the sound