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.
當我們寄信或寄賀卡時，我們必須在信封或賀卡上貼郵票。人們什么時候開始使用郵票的呢?誰是第一個想到這個主意的人呢?下面是一些相關信息。
