second sacral vertebra造句

The underside of the second sacral vertebra has an angular longitudinal keel.
The dural sac ends at the vertebral level of the second sacral vertebra.
It contains fragments of both wings including the right fourth metacarpal, parts of the shoulder girdle and the second sacral vertebra.
The spine of the second sacral vertebra steeply curves upwards again, joining the forty-eight centimetres high broad fan-shaped spines of the third and fourth sacrals.
It's difficult to find second sacral vertebra in a sentence. 用second sacral vertebra造句挺难的