可识别的骨盆骨折出血源有3种，动脉、静脉和骨折端松质骨出血。
Three sources of bleeding are recognised in pelvic fractures, arterial, venous and bleeding from cancellous bone.
首先动画的根节点，如角色的上半身或骨盆位置，然后直到身体的未端。
This consists of animating the root of the hierarchy first, like the torso or pelvis of a character, and then working outwards towards the extremities.
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