The long axis diameter processing, need to resist center hole;
加工长轴外径时，需顶住中心孔；
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。
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。
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。
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