2. structure, voice box, throat, and face the กอัล and found that teens will grow clearly faster than female teens. That is why teen male voice cracking.
2. The structure of the face, throat, larynx and bone alloy. And found that teenage boys are growing faster than the girls. As a result, young men crash
2. Facial structures, larynx, neck, and bone alloys. And found in male adolescents will grow faster than female adolescents clear. Cause of male adolescents crack