That to know by the somatotype transformed, one grade raised to 3rd grade, ectomorph type trend to Mesomorph type or Endomorph type, Until 4th grade trend to Ectomorph type or Mesomorph type. 4.
㈢由罗列指数的年变化，了解学生年成
的体
变化，由一年
年时，从瘦趋向适中、
，四年则及趋向瘦、适中的体。
