sacral curvature

...弯曲(thoracic curvature) | 荐弯曲(sacral curvature)}

...A)胸曲(thoracic curvature)与荐曲(sacral curvature)属於原发性弯曲(primary curvatures) (B)婴儿可行走时腰曲(lumbar curvatur...