在无线电通讯还未普及、互联网还未深入千家万户的时候,人们的信息交流主要靠信件。而邮票,就成了许多人的至爱。许多国家和地区发行的邮 At a time when radio communications have not yet become widespread and the Internet has not yet reached millions of households, people rely mainly on letters for information exchange. Stamps have become the favorite of many people. Many countries and regions issued by post