Thus, people have great demand for high performance and big capacity telecommunication systems.
相应地，人类对高性能大容量无线通信系统的需求也越来越大。
Therefore, the transformation and upgrade of the old information systems become an urgent demand.
因此，对旧的网络信息系统的改造和升级成为了网络信息系统中的迫切需求。
Therefore, the transformation and upgrade of the old information systems become an urgent demand.
因此，对旧的网络信息系统的改造和升级成为了网络信息系统中的迫切需求。
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