Pity the postal systems of the large economies. Many had centre stage during the development of communications. Letters, telegraph messages and, later, phone calls all came under their watch. Then digital came along.
请怜悯一下大型manbetx20客户端下载 体的邮政系统吧。在通信发展时期，邮政系统处于中心位置，信件、电报还有后来的电话都隶属于邮政系统。然后数字化来了。
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