每隔一段时间后，所谓的“永久性道路”即电路轨道就需要更换。这段时间的长短，部分取决于运输量，部分取决于当地的条件。
After regular intervals which depend partly upon the amount of traffic carried and partly upon the local conditions, the so-called: "permanent way" requires replacement.
采用精密耐磨轨道及模块化设计，更换维修方便使用。
Convenient replace and maintain with the design of wear-resisting track and modularization.
它可以发射人造卫星或给卫星补充燃料，把卫星移动到新轨道上，或者更换它们的软件和硬件。
It could re lease or re fuel satellites, move them to new orbits, or re place their hard ware and software.
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