INTRODUCTION
Women after menopause and senile people are multiple population ofosteoporosis because of losing much substance of bone, which also isconsidered the important reason causing fracture. But young peopleoften also loes subetance of bone on different extent with increasingage because seeing from natural physiological phenomenon, the ab-sorption activities of osteoclast significantly increase after 30 to 35years old, however, the function of oeteoblast do not increase. In ad-dition, some occupational characteristics of you...
