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架设一趟通信线路要花费巨大的资金、人力和时间,仅耗铜量每对电话线每公里就达170公斤。因此,怎样提高通信线路的利用率是一个重要的问题。在日常生活中,有许多提高利用率的方法。比如,在同样大小的一块土地上,盖平房只能住几户人家,而造楼房就可以使住户成倍地增加,由于所占的空间不同,可以分出各家各户。一座长江大桥,火车、汽车之所以能同时行驶,是由于它是一座多层桥梁,火车在铁路桥面上走,汽车在公路道上跑。各走各的道,互相不干扰。由建楼筑桥联想到信息传输,
Erecting a communication line takes a great deal of money, manpower and time, consuming only 170 kilos of copper per kilometer of telephone line. Therefore, how to improve the utilization of communication lines is an important issue. In everyday life, there are many ways to improve utilization. For example, on a piece of land of the same size, a bungalow can only occupy a few households, while building a house can double the number of dwellings. Due to the difference in space, households can be separated. A Yangtze River Bridge, trains and cars are able to travel at the same time because it is a multi-storey bridge. The train goes on the railway bridge deck and the car runs on the highway. Go each way, do not interfere with each other. Building by the building bridge think of information transmission,