When we send a letter or a postcard, we have to put stamps on the envelope or on the card.When did people first begin to use stamps?Who was the first to think of this idea? Here is some information about it.
当我们寄信或寄贺卡时，我们必须在信封或贺卡上贴邮票。人们什么时候开始使用邮票的呢?谁是第一个想到这个主意的人呢?下面是一些相关信息。
