专用计算机网络 meaning in English

specific computer network

Every field has its own special computer network , however they still use the switching network of programming control which is provided by the post telephone and telegraph system . the cost of the telephone is a large part in the spending of every department . instructing the switching network to realize the telephone communication needs much of equipment charges , lines charges , protection charges , project charges and time
虽然各行业都有自己的专用计算机网络，但是各行业仍利用邮电系统提供的程控交换电话网络通信，需支付大量的电话费，占用了各部门的很大一部分开销；建立程控交换电话网络实现电话通信需要大量的设备费、线路费、维护费和工程费等费用，并且需要一定的施工工期。