二是耐磨、可更换，大大延长了传动部件的使用寿命；

Second, it is wear-resisting, replaceable, so greatly extend the service life of the driving part.

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这些矫形假体可包括关节端部假体的元件以及更换居间骨骼缺损的部件。

These orthopaedic prosthetics may include elements of a joint endoprosthesis as well as components to replace intercalary bone loss.

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在假定故障部件不能“修复如新”的条件下，基于几何过程模型研究可修串联系统的最优更换策略。

An optimal replacement policy for series repairable system is studied assuming that the component after repair is not "as good as new" by using the geometric process model.

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