Use a long rod as hinge axis and stick it through both hinges.
用长杆为铰链轴，并坚持它通过两个铰链。
The main direction of the vessels was parallel with the long axis of the teeth.
其主要的血管走行方向为与牙齿长轴平行。
The long axis diameter processing, need to resist center hole;
加工长轴外径时，需顶住中心孔；
The long axis diameter processing, need to resist center hole;
加工长轴外径时，需顶住中心孔；
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