... positioning accuracy 定位精度 positioning action 定位作用 positioning bolt 调位螺栓，定位螺栓 ...
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但网络学习中的导航除了定位作用，更重要的是体现导航的学习辅助功能。
Besides orientating function, the more important function of the navigation in E-learning is to assist learning.
目的：探讨CT在帕金森病丘脑腹外侧核及苍白球腹后部毁损术中的定位作用。
Objective: to probe the role of ct in guided thalamotomy and posteroventral pallidotomy for Parknson's disease.
生物陶瓷人工椎体不仅具有良好的生物相容性，而且在治疗椎体肿瘤中有靶向定位作用；
Bio-ceramic artificial vertebral body not only has good biocompatibility, but also plays a role in targeting location of vertebral tumors.
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