stamp with the size

例句：

1. 1. The stamp on the envelope isfrom our president.
   信封上的印章是总统的。
2. 2. The stamp collectors are always lookingfor rare stamps.
   集邮者总是在寻找稀有的邮票。
3. 3. Thestamp was a gift frommy grandfather.
   这枚邮票是我祖父送我的。