现代社会对于通信的依赖性越来越强，因此网络的保护和恢复是网络建设和维护的关键之一。

Modern society is increasingly depending on communications, therefore network protection and restoration has become one of the key elements of network construction and maintenance.

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讨论有线电视网络中传输数字电视存在的问题，并对HFC网络建设和维护等技术问题进行探讨。

This article discusses some problems of wired television network in the transmission of digital TV, probes into some technical aspects in the construction and maintenance of HFC network.

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网络工程师能够从事计算机信息系统的设计、建设、运行和维护工作。

Network engineer can be engaged in the computer information system's design, the construction, the movement and the maintenance work.

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