third sacral vertebra造句

例句与造句

1. It divides, opposite the third sacral vertebra into two branches, which descend one on either side of the rectum.
2. The human rectum is about long, and begins at the rectosigmoid junction ( the end of the sigmoid colon ), at the level of the third sacral vertebra or the sacral promontory depending upon what definition is used.
3. It's difficult to find third sacral vertebra in a sentence. 用third sacral vertebra造句挺难的