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近十几年来，电话通信是世界上发展最为迅猛的产业之一，无论是固定电话，还是移动电话，用户数量均急剧攀升。目前，我国电话通信发展势如破竹，固定电话用户总量将接近２亿户，世界排名第２位，移动电话拥有量也将超越４ ０００万部大关，世界排名第３位。然而，是否有人曾想
In the past decade or so, telephone communications has become one of the most rapidly developing industries in the world. The number of subscribers has risen sharply in both fixed and mobile phones. At present, the development of telephone communications in our country is quite prosperous. The total number of fixed telephone subscribers will be close to 200 million and the number two in the world. The number of mobile phones will also exceed 40 million and rank the 3rd in the world. However, did anyone ever think