This means your neck and spine should be in a neutral position, shoulders and torso relaxed, knees bent at 90 degrees with both feet flat on the floor.
这也就是说你的脖子和脊柱应该处于中正的位置，肩膀和躯干放松，膝盖弯曲呈90度角，双脚平放在地面上。
2
At the hospital, doctors performed an emergency operation to repair broken bones in his spine and put it back in the correct position.
在医院，医生给他做了紧急手术，修补他脊柱中的碎骨并将其复位。
3
Get your partner to lie in this position and look at their spine and neck - they should be in a straight line.