人体有二百多块骨头,每一块都彼此连结在一起,形成一个整的骨架,其中的颅腔和椎管保护着脑和脊髓,胸廓保护着胸腔的脏器,骨盆腔保护着骨盆胆的脏器;除了这些保护功能以外,它还支持着身体的软组织,构成人体出外表轮廓,以及由于肌肉的收缩产生运动。所以身体各个部分的活动,是由于在各个地方存在着一段一段的骨所造成的。至于活动的程度和特性,就要看这一块骨和另一块骨是怎样连结成一起来决定。也就是说,有什么样 The body has more than two hundred bones, each one are linked to each other to form a whole skeleton, of which the cranial cavity and spinal canal to protect the brain and spinal cord, thorax protect the thorax organs, the pelvic cavity protect the pelvic guts In addition to these protective functions, it supports the soft tissues of the body that form the outline of the human body and produce movement due to muscle contraction. Therefore, the activities of various parts of the body are caused by the existence of a period of bone in various places. As for the degree and nature of the activity, it depends on how the bone is linked to the other bone. In other words, what kind of