Access to a network may be denied when the modification itself materially and adversely affects the operation of the network or violates the rules and protocols for communication across the network.
当修改本身实际上相反地影响了网路的运行，或者违反了网路通信的规则和协定时，网路访问可以被拒绝。
The paper begins with a brief review on the existing communication networks actually in operation. Then, it explains the motive forces to promote the reform of present communication network structure.
本文首先简要地回顾了国际上现有三类通信网的实际运用情况，分析推动通信网结构革新的主要因素。
A-GPS is adopted by mobile operation companies as the highest accurate position way in mobile location-based service. It combined the technology of GPS and mobile communication network.
GPS定位技术是目前移动运营商推出的移动位置服务中所采用的精度最高的定位方式，它结合了GPS定位技术及移动通信网络的优势于一身。
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