求翻译：网络建成以后，我们只有不断开发其功能，才能为教学提供有效的技术手段支持。一些院校校园网建成以后，仅仅是作为文件传输的工具，网络运行效益极低，这不仅是巨大的浪费，更给网络教学的开展带来了技术上的障碍。是什么意思？

After the network is completed, we have to keep developing its capabilities, to provide effective technical means for teaching support. After some college campus network built simply as a tool for file transfers, network operation efficiency is very low, it is not only a great waste, brought more to the development of network teaching technical barriers.