Selection pressure for this efficient style of locomotion favored longer and more flexible spinalcolumns.
受天择压力,他们朝向耗能较少的移动模式演化,因而脊椎柱更长,更灵活。
2
Under the bilateral trade agreement, U.S. exporters must remove spinalcolumns, brain tissue and other parts considered linked to the mad cow disease.
在双方达成的协议下,美国出口商必须去除有可能导致疯牛病的牛脊肉、脑组织以及其它部分。
3
BACKGROUND: Pedicle screw which passes through the three columns and has three-dimensional correction function, which has quickly become the standard posterior spinal internal fixation.