1·The thecal sac and nerve root are then gently retracted and protected with a nerve retractor.
使用神经牵引器轻柔的牵拉与保护硬膜囊与神经根。
2·The left iliac artery and the distal abdominal aorta were retracted to the right side at the l4-l5 disc level by a measuring retractor to which a strain gauge was attached.
用一个带有张力测量器的牵引器在l4—l 5椎间盘水平将左髂动脉和腹主动脉末段牵向右侧。