跑道延长装置（选配）可以让举升机服务更长机型；

The elongated track device (optional) can make the lift available for long vehicles.

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对于长阀杆的延长装置，需要提供适当的和坚固的支撑座。

Adequate and rigid support must be provided for long stem extension units.

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目的：观察自制的牙支抗骨延长装置进行羊下颌骨延长的实用性和有效性。

Objective: To observe the effects of an intror al tooth supported distraction device on advancement mandible of goat.

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